What is bash/shell script?

Bash (Bourne Again SHell) is a Unix shell and command language. It's commonly used for automating tasks, scripting system administration, and creating executable programs that interact with the operating system. It interprets commands typed by the user or read from a script file and executes them. Shell scripts are collections of these commands, often including control flow (if/then/else), loops (for/while), and variable manipulation.