Zsh is a shell (e.g. bash replacement) designed for interactive use, although it is also a powerful scripting language. .
Zsh is a UNIX command interpreter (shell) which of the standard shells most resembles the Korn shell (ksh); its compatibility with the 1988 Korn shell has been gradually increasing. It includes enhancements of many types, notably in the commandline editor, options for customising its behaviour, filename globbing, features to make Cshell (csh) users feel more at home and extra features drawn from tcsh (another `custom' shell).
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command-line shell terminal-client unix-shell unix-terminal