The bash command opens a Bourne-again sheel (bash) session. The Bourne-again shell (bash) is the standard shell used in most Linux computers. It uses commands similar to a UNIX shell. Bash includes features such as:
Command completion when pressing the tab key.
Improved arithmetic functions.
Command Prompt is a command-line interpreter application available in most Windows operating systems. It's used to execute entered commands. Most of those commands automate tasks via scripts and batch files, perform advanced administrative functions, and troubleshoot or solve certain kinds of Windows issues. The Windows command prompt is a feature that's been a core part of the Windows operating system for a long time.