What is the role of the client in the system or application?

A client in a system or application is an end user or component that initiates requests to the system's services or functionalities. The role of the client includes:

• Requesting data or services from the server or application.
• Interacting with the interface (GUI, API, etc.) to perform tasks.
• Receiving and processing responses from the system.

For example, in a web application, the client is the user's browser, which sends HTTP requests to the server and displays the received information. In testing, the client can be an automated script that checks the API's operation.

Thus, the client is the initiator of interaction and the consumer of the system's functionalities.