# WebSocket vs REST API: Key Differences & Comparison
> Explore the differences between REST and WebSocket protocols. Learn when to use stateless REST APIs vs real-time full-duplex WebSockets for your apps.

Tags: websocket, rest-api, web-development, backend, networking-protocols, software-architecture, real-time-data
## WebSocket vs REST API | Learn the Basics of Web Communication
- Overview of the two most common data exchange protocols in modern applications.

## What is REST API?
- **REST:** Representational State Transfer.
- Uses standard HTTP methods: GET, POST, PUT, DELETE.
- **Stateless:** No context is saved between requests.
- Data is typically formatted as JSON.

## The Request-Response Cycle
- REST communication is unidirection; the client must initiate every request for data.

## What is WebSocket?
- A protocol for full-duplex communication channels.
- **Persistent Connection:** The connection remains open after the initial handshake.
- **Real-time:** Facilitates instant two-way data flow with low latency.

## REST vs WebSocket: Key Differences
- **State:** REST is stateless; WebSocket is stateful.
- **Initiation:** REST is client-initiated only; WebSocket allows server push.
- **Overhead:** REST has higher overhead due to frequent headers; WebSocket has low overhead after the initial handshake.

## Protocol Efficiency Comparison
- **Message Overhead:** REST sends heavy HTTP headers (~800 bytes) per request. WebSocket sends tiny frames (~2-8 bytes) after connection.

## Use Cases
- **Use REST for:** User profiles, web forms, search results, and static content caching.
- **Use WebSocket for:** Live chat, multiplayer games, real-time co-editing, and live stock price updates.

## Summary
- REST is better for general, document-based requests.
- WebSocket is optimized for persistent, conversation-like streaming.
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