Hackers use proxy servers to hide their actual location. When sending a request via a proxy server, the hacker's exact IP address is replaced by the proxy server's IP address, thereby concealing their real identity. This approach helps them undertake clandestine operations without being caught. However, using a free web proxy over the Internet does not guarantee the privacy of their identity, as these servers primarily maintain a log of IP addresses from where requests are coming. To completely secure their activity over the Internet, hackers leverage a chain of anonymous proxy servers that adds multiple layers of encryption to the packets, making them untraceable.