Definition: A command is a specific instruction given to a computer application to perform some kind of task or function.
In Windows, commands are usually entered via a command line interpreter like Command Prompt or Recovery Console.
Important: Commands must always be entered into a command line interpreter exactly. Entering a command incorrectly (wrong syntax, misspelling, etc.) could cause the command to fail or worse, could execute the wrong command or the right command in the wrong way, creating serious problems.
Examples:
"I thought there might be a problem with an important Windows operating system file on my computer so I ran the sfc command from Command Prompt. Sure enough, it fixed several DLL files and my computer was back up and running after a reboot."
