Answer Description

MD (same as MKDIR) is a command used to create a new folder or directory in a Windows environment.

Wikipedia

In computing, pushd and popd are commands used to work with the command line directory stack. They are available on command-line interpreters such as 4DOS, Bash, C shell, tcsh, Hamilton C shell, KornShell, cmd.exe, and PowerShell for operating systems such as Windows and Unix-like systems.