Explain the concept of Stateless in the context of REST architecture.

In REST architecture, the principle of Stateless means that each request from a client to a server must contain all the necessary information for its processing. The server does not store the client's state between requests. This simplifies scaling and increases reliability, as the server does not depend on previous interactions.

For example, if a client makes a request to retrieve data, it must send all parameters and authentication data in that request, and the server should not rely on stored sessions or context.