Can you explain the main principles of REST and its architectural features?

REST (Representational State Transfer) is an architectural style for creating web services based on the use of standard HTTP methods and resources.

Main principles of REST:

• Client-server architecture: clients and servers are separated, which simplifies development and scaling.
• Stateless: each request from a client to a server must contain all the necessary information; the server does not store state between requests.
• Caching: responses can be cached to improve performance.
• Uniform interface: using standard HTTP methods (GET, POST, PUT, DELETE) for resource operations.
• Resource identification: each resource has a unique URI.
• Layered system: architecture can have intermediate servers, proxies, and gateways.

Example: to get information about a user with id=1, a GET request is made to /users/1, and to create a new user, a POST request is made to /users with data in the request body.