What is the difference between Filters and Condition & Formula and Variable? - BO Designer

What is the difference between following?

i. Filters and Condition
ii. Formula and Variable

Filters and Condition:

- Filters are designed at Universe Level

- Conditions are defined at Report Level

Formula and Variable:

- A named formula is referred to as variable

- Conversion of formula into variables is needed when they are used for more than once in a report.

How data is restricted based on user profiles?

- Data is restricted by implementing Row Level Security in Supervisor.