Which testing type is focused on ensuring that applications function as intended?

Functionality testing is designed specifically to verify that an application performs its intended functions correctly. This type of testing assesses the features and capabilities of the software to ensure they operate according to the specified requirements. During functionality testing, testers check various functionalities of the application, including user interactions, workflows, and overall performance concerning the expected outcomes.

While other testing types like integration testing, system testing, and user acceptance testing also aim to evaluate software quality and performance, they do so from different angles. Integration testing focuses on the interaction between integrated components or systems to confirm they work together as expected. System testing evaluates the complete and fully integrated software product to ensure it meets the specified requirements. User acceptance testing validates the usability and acceptance of the software from the end-user perspective, often ensuring that it solves the intended problem for its users.

Each of these approaches is essential in the overall software development life cycle, but functionality testing is particularly centered on confirming that the application does what it is supposed to do according to its design and requirements.