What is the SSH sshd?

SSHD, or Secure Shell Daemon, is a software program that runs on a server and enables secure remote access and administration of the server. It is a part of the SSH (Secure Shell) protocol suite, which provides a secure channel for communication between a client and a server. SSHD listens for incoming SSH connections and handles authentication, encryption, and data transfer between the client and the server. It allows users to securely log in to a remote system, execute commands, transfer files, and perform administrative tasks over an encrypted connection, ensuring confidentiality and integrity of the data exchanged.