PuTTY
PuTTY is a free and open-source terminal emulator, serial console, and network file transfer application. It supports several network protocols, including SSH, Telnet, rlogin, and SCP, primarily used for secure remote access to servers and network devices. It is widely known for its simplicity, reliability, and availability on Windows, though versions exist for other platforms.
Developers should learn PuTTY when they need to securely connect to remote servers, such as Linux or Unix systems, for administration, debugging, or deployment tasks, especially in environments where graphical interfaces are unavailable. It is essential for system administrators, DevOps engineers, and backend developers working with cloud infrastructure or on-premise servers, as it provides a lightweight and secure way to execute commands and transfer files over SSH.