We can establish a relation between objects in Salesforce. We can associate one object with others.
Example: We have an object party (To store information about the party), and you want to associate it with other objects like people (information of participants) so that you can associate the object party with people. These relationship types also determine how they handle record sharing, required field in page layouts, data deletion capability.
Salesforce supports the following types of relationships that can be established among objects.
* Master-Detail Relationship
* Lookup relationship
* Self-relationship
* External lookup relationship
* Indirect lookup relationship
* Many-to-Many relationship
* Hierarchical relationship
