What is Bash?
Bash. Bash, though typically not capitalized, is an acronym for "Bourne-Again Shell" and is named after Stephen Bourne, the creator of the Unix shell "sh." It is a command language interpreter derived from sh that can execute commands entered at a command prompt and process text file input.
What is it used for?
Bash is a command processor that typically runs in a text window where the user types commands that cause actions. Bash can also read and execute commands from a file, called a shell script.