Whenever you have a command (internal or external) that you need to execute often, one that's too complex to be dependably typed manually at the Command Line, one that needs to be part of an exact sequence of other commands, one that you want to be able to easily repeat from another location or share with others, or you repeat very often and therefore want to have a very short name, you can store that command as part of a convenient ALIAS and/or batch file.