What is REST architecture?

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REST (Representational State Transfer) is an architectural style for designing networked applications. It is widely used in web services because it is lightweight, scalable, and stateless. RESTful services allow communication between client and server using standard HTTP methods like GET, POST, PUT, DELETE, PATCH.

Key Principles of REST Architecture:

1. Client-Server Separation:

   • The client handles the UI, while the server manages data and business logic.

   • This separation improves scalability and flexibility.

2. Statelessness:

   • Each request from the client must contain all necessary information.

   • The server does not store client context between requests.

3. Uniform Interface:

   • Resources are identified by URIs (Uniform Resource Identifiers).

   • Example: /api/users/1 identifies a user with ID=1.

4. Resource Representation:

   • Resources are represented in formats like JSON, XML, or YAML.

   • Clients interact with resource representations, not the underlying database directly.

5. Cacheability:

   • Responses can be cached to improve performance and reduce server load.

6. Layered System:

   • REST APIs can have multiple layers (e.g., load balancers, proxy servers) without affecting communication.

7. Code on Demand (optional):

   • Servers can return executable code (like JavaScript) to clients when needed.

Example:

• GET /api/products → Fetch all products

• POST /api/products → Add a new product

• PUT /api/products/10 → Update product with ID=10

• DELETE /api/products/10 → Remove product with ID=10

👉 In short, REST architecture is a stateless, resource-based approach to building scalable APIs, making web communication simple, flexible, and standardized.

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