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Bash is the shell, or command language interpreter, for the gnu operating system. The name is an acronym for the ‘Bourne-Again Shell’, a pun on

Stephen Bourne, the author of the direct ancestor of the current Unix shell sh, which appeared in the Seventh Edition Bell Labs Research version
of Unix. 

Bash is largely compatible with sh and incorporates useful features from the Korn shell ksh and the C shell csh. It is intended to be a conformant
implementation of the ieee posix Shell and Tools portion of the ieee posix specification (ieee Standard 1003.1). It offers functional improvements
over sh for both interactive and programming use. 

While the gnu operating system provides other shells, including a version of csh, Bash is the default shell. Like other gnu software, Bash is quite
portable. It currently runs on nearly every version of free Unix bonus and a few other operating systems − independently-supported ports exist for ms-dos,
os/2, and Windows platforms.                                                     

[Please navigate using the left panel.]                                                                                                                                                                                  - The GNU Bash Reference Manual, for Bash, Version 4.0.