> ## Documentation Index
> Fetch the complete documentation index at: https://cometchat-22654f5b-docs-platform-agentic.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.
# Core Features
CometChat's Core features are the essentials you need to deliver a complete, real-time chat experience. Use these features as the foundation for reliable one-to-one and group conversations.
**Out-of-the-box in:** [UI Kit Builder](/chat-builder/react/features) ✅ | [Widget Builder](/widget/html/features) ✅ | [UI Kits](/ui-kit/react/core-features) ✅ | [SDK](/sdk/javascript/overview) ✅
### Implementation
| Technology | Support | Docs |
| ---------------------------------------------- | ------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [UI Kit Builder](/chat-builder/react/features) | ✅ | |
| [Widget Builder](/widget/html/features) | ✅ | |
| [UI Kits](/ui-kit/react/core-features) | ✅ | 
|
| [SDK](/sdk/javascript/overview) | ✅ | |
***
### **Instant Messaging**
Enable real-time one-to-one and group chat so users can send and receive messages instantly. Messages are delivered in milliseconds with automatic retry and offline queuing.
**When to use:** Customer support, team collaboration, social apps, marketplace buyer-seller communication.
### **Media Sharing**
Let users share images, videos, documents, and other files directly within conversations. Supports common formats including PNG, JPG, GIF, MP4, PDF, and more.
**When to use:** Sharing product photos, sending contracts, collaborating on designs, sharing receipts.
### **Group Chats**
Support conversations with multiple participants for teams, communities, or events. Groups can be public (open to join) or private (invite-only).
**When to use:** Team channels, community forums, event coordination, study groups.
### **Read Receipts**
Show when messages are delivered and when they are read, so users know message status at a glance. Displays delivery and read timestamps for transparency.
**When to use:** Business communication where confirmation matters, time-sensitive messaging.
### **Mark as Unread**
Allow users to mark messages as unread so they can revisit important conversations later. Helps users manage their inbox and prioritize responses.
**When to use:** Flagging messages for follow-up, managing high-volume conversations.
### **Typing Indicator**
Display when another user is typing to make conversations feel more responsive and natural. Creates a real-time, in-person conversation feel.
**When to use:** Live support chats, real-time collaboration, social messaging.
### **User Presence**
Show online, offline, and last-seen states to help users understand availability. Automatically updates based on user activity.
**When to use:** Knowing when teammates are available, seeing if support agents are online.
### **Reactions**
Let users react to messages with emojis for quick feedback without sending a new message. Reduces chat clutter while maintaining engagement.
**When to use:** Acknowledging messages, voting on ideas, expressing sentiment quickly.
### **Mentions**
Tag specific users (or everyone in a group) to draw attention inside busy conversations. Mentioned users receive notifications even if they've muted the conversation.
**When to use:** Getting someone's attention in busy channels, assigning tasks, escalating issues.
### **Threaded Conversations**
Create message threads inside group chats to keep context organized. Keeps side discussions from cluttering the main conversation.
**When to use:** Discussing specific topics in team channels, Q\&A sessions, detailed follow-ups.
### **Quoted replies**
Reply to a specific message with a quote to maintain clarity and context. Makes it clear which message you're responding to in busy conversations.
**When to use:** Answering specific questions, referencing earlier points, providing context.
### **Report Message**
Allow users to report inappropriate or harmful messages directly from chat. Reports can be reviewed by moderators to maintain community standards.
**When to use:** Community moderation, compliance requirements, user safety.
### **Conversation and Advanced Search**
Search conversations by user or group name, apply advanced message filters such as links, attachments, reactions, mentions, or specific mentioned UIDs, and search across all conversations.
**When to use:** Finding past discussions, locating shared files, auditing conversations.
Conversation search and advanced message search requires enabling the feature in the CometChat dashboard under **Chat and Messaging** → **Features** → **Conversation and Advanced Search**.
