Compact and Repair are used for two reasons to repair corrupted data and to eliminate wasted space. A database file can be corrupted if shared over a network or multiple users are using it simultaneously, which can corrupt the file. The Compact and Repair feature is needed to fix this issue.  Whenever individuals add, update a database, and change its design, the database will grow larger. Due to the growth in your database, objects will open slowly, queries may take longer to run, and normal operations will take longer to perform, so Compact and Repair are needed to remove space from the database.