Summary  
This chapter demonstrates how to perform compound logical tests by combining multiple conditions with AND and OR functions and how to nest them with IF to produce customized conditional outcomes.

General domain of usage  
Data validation

Using the `AND` and `OR` allows you to perform more **sophisticated logical tests** by combining **multiple conditions**. 

## Key Points

- Use the `AND` **function** to test if **all** conditions are met like this: `=AND(condition1, condition2,...)`;
- Use the `OR` **function** to test if **at least one** condition is met like this: `=OR(condition1, condition2, ...)`.

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Combining AND & OR in Excel

Key Points