What are dependent fields and blocks?

With Dependent Fields and Blocks, you can define dynamic business rules at the field level. They are activated only when the configured condition is satisfied. Additionally, you can set rules to mark a field as mandatory or read-only.

For example, you can define a condition where the Location field must be revealed only when you fill out the Phone Number field in a record. 

Watch a video to understand the working clearly.
To know more about Dependent Fields and Blocks, click here.