Functional Testing:

Purpose: Functional testing evaluates the behavior of a software application. It ensures that the software functions are working as expected.
Methods: Functional testing includes methods such as unit testing, integration testing, system testing, and user acceptance testing.
Examples:

1. Testing the login functionality of a website to ensure users can access their accounts.
2. Testing calculations in a financial application to ensure accuracy.

Non-Functional Testing:

Purpose: Non-functional testing focuses on quality attributes like performance, reliability, usability, security, and scalability. This type of testing assesses how well the software performs under various conditions.
Methods: Non-functional testing includes Methods such as performance testing, load testing, stress testing, security testing, usability testing, and reliability testing.
Examples:
1.Testing the response time of a web application under heavy load to ensure acceptable performance.
2.Testing the ability of a system to handle a large number of users.
3.Testing the security of an application against potential vulnerabilities.

In summary, functional testing ensures that the software behaves according to its functional requirements, while non-functional testing focuses on evaluating quality attributes such as performance, reliability, and security. Both types of testing are ensuring the overall quality and success of a software application.