Chapters:
0:00 Starting Tutorial
0:03 Opening ArcMap Software
0:15 Navigating Database
1:25 Creating a Relationship
2:30 Querying Related Records
4:11 Moving Related Features
5:00 Deleting Related Objects

In ArcMap, a relationship classes is used to establish and maintain logical connections between records in different tables or feature classes without duplicating the data. A relationship class is a way to associate and maintain a onetoone, onetomany, or manytomany relationship between two feature classes or tables in a geodatabase.

Setting up Relationship Classes:
Relationships are typically defined in a geodatabase using ArcMap.
Open ArcMap, navigate to your geodatabase, rightclick, and choose "New" and then "Relationship Class".
Define the origin and destination tables, specify the relationship type, and establish the relationship between the fields.

Working with Relationship Classes:
Once established, relationship classes enable you to perform various operations:
Query Related Records: You can perform queries to find related records between the origin and destination tables.
Editing: Changes made in one table can be reflected in the related table; moving related features, deleting related objects

In summary, relationship classes are a more structured and permanent way to establish and manage relationships between tables in a geodatabase. They are defined at the geodatabase level and enforce rules to maintain data integrity. Relates, on the other hand, are more adhoc and temporary, established within an ArcMap session for specific analytical purposes without altering the underlying database schema. They provide a more flexible but less strict approach to linking and exploring related data in a map document.