Batch files contain a group of MS-DOS commands that are run in successive order. What filename extension identifies batch files?

When a batch file is run, the shell program (usually COMMAND.COM or cmd.exe) reads the file and executes its commands, normally line-by-line. Unix-like operating systems, such as Linux, have a similar, but more flexible, type of file called a shell script. The filename extension . bat is used in DOS and Windows.