Tcsh is an enhanced version of the C shell (csh), which is a command-line interpreter for Unix-like operating systems. It provides features like command-line editing, programmable completion, and a more user-friendly interface. Tcsh is often preferred by users who want a more interactive shell experience. One of the key features of Tcsh is its ability to customize the command prompt and support for scripting. It allows users to create scripts that automate tasks, making it a powerful tool for system administrators and developers. Overall, Tcsh combines the functionality of traditional shells with modern enhancements for better usability.