Zsh is a Unix shell, which is a program that provides an interface between you and the operating system. Shells allow you to execute commands, and they also provide a variety of features that make it easier to work with the operating system, such as file management, command history, and support for scripting.

SSH (Secure Shell) is a network protocol that allows you to securely log in to a remote computer. It encrypts all traffic between your computer and the remote computer, so that your data cannot be intercepted by anyone else.

So, the main difference between Zsh and SSH is that Zsh is a command-line tool for interacting with your local computer, while SSH is a network protocol for interacting with a remote computer.

Here is a table summarizing the key differences between Zsh and SSH:

FeatureZshSSH
PurposeCommand-line shellNetwork protocol
UsageLocal computerRemote computer
SecurityNot encryptedEncrypted

I hope this helps!