ssh:tldr:417e3

The command "sshd" is an abbreviation for "Secure Shell Daemon." It is a program that allows secure remote access to a computer or server using the SSH (Secure Shell) protocol.

When you run the "sshd" command, you start the SSH server daemon on your machine. This creates a secure channel for encrypted communication between the local and remote devices. By establishing an SSH connection, you can access the command-line interface (shell) of the remote system and perform various administrative tasks or run commands remotely.

Once the SSH server daemon is running, it listens on a specified port (typically port 22) for incoming SSH connections. When a client machine initiates a connection request, the SSH server authenticates the client's identity through various methods like passwords, public key authentication, or other authentication mechanisms configured on the server.

Once the authentication is successful, the SSH server provides a secure interactive session or executes a single command on the remote system, depending on the requested operation.

In summary, running the "sshd" command starts the SSH server daemon, enabling secure remote access to your machine.