SSH (Secure Shell) is one of the most important and popular protocols used in networking and server management. It provides a secure and reliable way to remotely access and control devices, replacing older methods like Telnet, which transmitted data in an open manner and exposed it to hacking. The basic idea of SSH is to provide an encrypted communication channel between the client and server using modern encryption technologies like AES and RSA. This ensures that passwords and commands cannot be read or modified as they travel across the network. One of its most prominent uses is that it allows you, as a system administrator or developer, to control servers and execute direct commands, transfer files securely using commands like SCP or SFTP, and even use it to tunnel applications or bypass network restrictions. For example, if you manage a server in a cloud environment like AWS or DigitalOcean, you will likely rely on SSH to access it and manage its settings. One of the advantages of SSH is that it relies on encryption keys in addition to passwords, allowing you to enable login using both a public/private key to significantly enhance security and reduce the possibility of hacking. Today, SSH is considered a standard for managing servers and digital infrastructure, and anyone working in IT or cybersecurity should be familiar with its use and best practices.