NOTE: Although relationship classes can be both created and edited in ArcInfo and ArcEditor, they are read-only in ArcView. The feature classes participating in a relationship class will also be read-only in ArcView.
You can create new relationship classes between any feature class or table within your geodatabase using tools in ArcCatalog. These tools can be used to create simple, composite, and attributed relationship classes.
Learn more about relationship classes.
Relationship classes appear in the ArcCatalog tree; you can inspect their properties as well as the relationships for any particular feature class.
The example in the following task shows how to create a relationship class between a feature class that stores parcel objects and a table that stores owner objects. It is a simple, nonattributed relationship. In the database, a parcel can be owned by a single owner and an owner can own a single parcel, so it is a one-to-one relationship.