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Excalidraw is an open-source virtual whiteboard application with a hand-drawn style. It's designed for creating diagrams, wireframes, and collaborative drawings.

## Purpose
- Web-based drawing tool with infinite canvas
- Hand-drawn aesthetic with support for shapes, arrows, text
- End-to-end encrypted collaboration
- Works offline as a PWA (Progressive Web App)

## Architecture
The project is organized as a monorepo with these main components:

1. Core Package (packages/excalidraw)
- React component library for embedding Excalidraw in any application
- Handles drawing, rendering, and core functionality
- Uses roughjs for the hand-drawn style
- Includes export capabilities (PNG, SVG)

2. Web Application (excalidraw-app/)
- Full-featured web app at excalidraw.com
- Built on top of the core package
- Adds collaboration features, local storage, sharing

3. Support Packages
- common - Shared utilities and constants
- element - Element manipulation and type definitions
- math - Mathematical functions for drawing
- utils - General utility functions

4. Examples
- Integration examples (Next.js, browser script)
- Shows how to embed Excalidraw in different environments

5. Documentation (dev-docs/)
- API documentation
- Integration guides
- Component documentation

## Key Features
- Real-time collaboration with end-to-end encryption
- Export to various formats (PNG, SVG, JSON)
- Customizable drawing tools (rectangle, circle, arrows, freehand)
- Dark mode support
- Localization
- Library of shapes and components
- Arrow bindings and labels
- Image support

## Technology Stack
- React for UI
- TypeScript for type safety
- Firebase for collaboration backend
- Jotai for state management
- Vite for development and building
- IndexedDB/LocalStorage for offline storage

The architecture allows for both using Excalidraw as a component in other applications and as a standalone web application with additional features.