Dynamic dependent drop down list

1. What is a dynamic drop down list?
2. Can you make Data Validation list dynamic?

What is a dynamic drop down list?

It's a list that we can select from in order to filter attendance data by department. The source of this dynamic data validation list has been created using the UNIQUE function. UNIQUE is a Dynamic Array Formula that returns all the unique values from a data range. In other words, it removes duplicates from a data set.

Can you make Data Validation list dynamic?

How do you validate dynamic data? In Excel, you can validate dynamic data using a dynamic drop down list. This is done by selecting the source for the drop down list as the range where new dynamic data will be added later.