Can you explain the working principle of REST API and its main features?

REST API is an architectural style for creating web services based on REST (Representational State Transfer) principles. Key features:

• Use of HTTP methods (GET, POST, PUT, DELETE) for resource operations.
• Resources are identified by unique URLs.
• Statelessness: each request contains all necessary information.
• Use of standard data formats, such as JSON or XML.

Example: a GET request to /users/123 returns data for the user with ID 123, while a POST to /users creates a new user.