sshd is the OpenSSH server daemon that allows secure remote access to a computer over a network. It uses the Secure Shell (SSH) protocol to encrypt data, ensuring that sensitive information remains protected during transmission. This makes it a popular choice for system administrators and users who need to manage servers securely. When a user connects to a server running sshd, they can execute commands, transfer files, and perform various administrative tasks. sshd supports various authentication methods, including password and public key authentication, enhancing security and flexibility for users connecting from different devices.