Ksh, or Ksh shell, is a command-line interpreter for Unix-like operating systems. It stands for "Korn shell," named after its creator, David Korn. Ksh combines features from both the Bourne shell and the C shell, making it a powerful tool for scripting and command execution. Ksh supports interactive use and scripting, allowing users to automate tasks and manage system processes efficiently. It includes features like command history, job control, and advanced scripting capabilities, making it popular among system administrators and developers. Its versatility makes it a valuable tool in the realm of Unix and Linux systems.