Functional testing is a type of software testing that focuses on verifying that individual functions or features of a website or application work as intended. This type of testing ensures that the website's functionality meets the requirements and specifications laid out in the design and development phase.

Functional testing covers a wide range of testing techniques and scenarios, including:
Unit testing: This type of testing focuses on individual components or functions within the website, such as individual forms or buttons.

Integration testing: This type of testing checks that different components of the website work together seamlessly and as expected.

End-to-end testing: This type of testing involves testing the website's functionality from start to finish, simulating real-world scenarios and user interactions.

Regression testing: This type of testing is performed after changes or updates have been made to the website, to verify that new changes do not break existing functionality.

The goal of functional testing is to identify and resolve any issues with the website's functionality before it is released to the public. This helps to ensure that the website provides a high-quality user experience and meets the expectations of its users.