Use variables when messaging specific mailing lists.
Variables are used for global/universal content across templates and messages. Variables are assigned to individual lists.
Example: A sports league places each player in a mailing list specific to that player's team. A variable with the tag team_name could be created, so any email to the players the that team/mailing list would contain that specific team's name.
Management limitation for locked variables
In ActiveCampaign, you can lock variables to prevent unauthorized editing or being overwritten by third-party integrations. Only admin users can lock or unlock a message variable.