What sniffers did you use? Tell me about their functions and why they are needed.

Sniffers are tools for intercepting and analyzing network traffic. I have used sniffers such as Wireshark, Fiddler, and Charles Proxy.

Main functions of sniffers:

• Intercepting HTTP/HTTPS requests and responses for API debugging.
• Analyzing network packets at the TCP/IP level to identify network issues.
• Viewing headers, request and response bodies, cookies, sessions.
• Ability to replay requests for testing.

They are used to understand how data exchange occurs between the client and server, identify transmission errors, verify the correctness of requests and responses, and for security purposes — for example, to ensure that data is not transmitted in plain text.