What Is REST?

REST, or Representational State Transfer, is an architectural style used to design APIs. It defines a set of principles for how web services should communicate in a simple and scalable way.

REST is built on standard HTTP methods such as GET, POST, PUT, PATCH, and DELETE. Each method represents an action: retrieving data, creating data, updating data, or removing data.

A REST API is stateless, meaning each request contains all the information needed to process it. The server does not store client session data between requests. This makes REST systems scalable and reliable.

Resources in REST are identified by URLs. For example, a URL may represent a list of users or a specific product. Responses are usually returned in JSON format.

REST emphasizes consistency and predictability. When APIs follow REST conventions, developers can understand and use them more easily without extensive documentation.

REST is widely used because it aligns naturally with how the web works. Browsers, servers, and networks are already optimized for HTTP communication.

It is important to note that REST is not a protocol or a programming language. It is a design philosophy. Many APIs claim to be RESTful but only partially follow its principles.

In summary, REST provides a clean and standardized way to build APIs. Its simplicity and scalability make it the dominant approach for web-based services.