GRANT and REVOKE commands in SQL are used to enforce security in the database where multiple users are involved. The commands are a part of the Data Control Language and can provide only the required set of permissions to a user for running a query.  For example,  GRANT SELECT ON employee TO temp_user; The above command grants `temp_user` the permission to run SELECT queries on the employee table.  REVOKE SELECT ON employee TO temp_user; The above command revokes the granted permission to `temp_user` to run SELECT queries on the employee table.  GRANT ALL PRIVILEGES ON organization.* TO temp_user; The above command provides `temp_user` with the permission to run any query, modify or alter the database, or even add tables and records for all the tables present in the organization database.