What are the differences between Functional Testing and Non-Functional Testing?

Functional Testing

- Validates the functionality of the software.

- Functionality describes what software does.

- Concentrates on user requirement.

- Functional testing takes place before Non-Functional testing.

Non-Functional Testing

- Verify the performance, security, reliability of the software.

- Non-Functionality describes how software works.

- Concentrates on user expectation.

- Non-Functional testing performed after finishing Functional testing.