A Lock is a restriction which prevents Users from adding or editing data for a particular time period. Locks allow you to prevent users from adding data to a Form for a time period when reporting has ended for example. They also allow you to preserve versions of your data after they have been validated by your information management processes.
Depending on your needs, a Lock can be set on any Form or Subform that has a Date/Month/Week field added as a Key field. Users will get an error message when they try to add a Record for the locked period and they won't be able to save the Record.