# Train Media Server to Compare Images

You must train Media Server by providing reference images as a basis for comparison.

The following diagram shows how Media Server stores the information you provide during training.

The "Media Server database" represents the Media Server datastore file or a database on an external database server. For information on setting up this database, see Set up a Training Database.

You can organize image comparison references into databases. These databases are for organizational purposes. When you run image comparison, you can restrict comparison to all of the references in a specific database, or to specific references in a specific database. Media Server creates a record for each comparison.

A database can contain any number of references. For each reference you must provide one training image. For information about choosing suitable training images, see Select Images for Training. You can also associate custom metadata with each reference.

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