A lock may refer to any of the following:
1. Lock is a term used to describe the method of preventing access to a file or some other data. For example, a user may lock access to the computer to prevent anyone from using it while they're gone.
Tip: Microsoft Windows users can lock their computers by pressing the shortcut key Windows key + L or press Ctrl+Alt+Del and then choose the lock option. Some keyboards may also have a keyboard function key or other key that also locks a computer.
3. Command found with some versions of Microsoft Windows that allowed a user to lock their drive. See the lock command page for further information on this command.
4. A physical lock on a computer that prevents it or an attached peripheral from being taken.
5. Short for lock up, a term to describe a computer or device that is not responsive.
6. A lock is also a small symbol shown when data sent over an Internet browser is secure.