What is REST API?

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A REST API (Representational State Transfer Application Programming Interface) is a way for software applications to communicate with each other over the web using the HTTP protocol. It follows a set of architectural principles that make systems simple, scalable, and stateless.

Key Features of REST API:

1. Resource-based: Everything is treated as a resource (like users, products, orders), each identified by a unique URL.

   • Example: https://api.example.com/users/1 refers to user with ID 1.

2. Stateless: Each request from the client to the server must contain all the necessary information. The server does not remember past requests.

3. Standard HTTP Methods:

   • GET → Retrieve data (e.g., fetch user details).

   • POST → Create a new resource (e.g., add a new user).

   • PUT/PATCH → Update an existing resource (e.g., update user info).

   • DELETE → Remove a resource (e.g., delete a user).

4. Data Format: REST APIs usually exchange data in JSON or XML, with JSON being the most popular because it’s lightweight and human-readable.

5. Uniform Interface: The way clients interact with resources is consistent, making APIs easy to use and understand.

6. Stateless & Scalable: Because each request is independent, REST APIs can handle large-scale distributed systems effectively.

In simple terms: A REST API lets two systems talk to each other over the internet by sending requests (like “get me the data” or “create a new record”) and receiving structured responses.

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