ksh, or the KornShell, is a Unix shell developed by David Korn in the early 1980s. It is an enhanced version of the Bourne shell and incorporates features from the C shell, making it powerful for both scripting and interactive use. ksh supports features like command-line editing, job control, and associative arrays, which enhance user productivity. One of the key advantages of ksh is its scripting capabilities, allowing users to automate tasks efficiently. It is widely used in various Unix-like operating systems, including Linux and macOS. Many system administrators and developers prefer ksh for its flexibility and robust features.