sshd is the SSH daemon which responds to incoming requests. Do not use this tag for questions about Solid-state hard drives! They should be tagged with "hybrid-storage" tag.
The SSH is Secure Shell which allows you to connect remote to servers securely since 1995, when the first version was released by Tatu Ylönen.
The SSH is client-server protocol and this tag is used for the playing around the SSH daemon. The most common implementation is OpenSSH, which you can find in most of the Linux systems at /usr/sbin/sshd and which can be configured in /etc/ssh/sshd_config.
Do not confuse this tag with the Solid-state hard drives. They should be tagged by hybrid-storage.
