Functionality Testing is a type of software testing that ensures a program operates according to its specified requirements. This process involves checking various features and functions of the software to confirm they work as intended. Testers evaluate user interactions, data processing, and system responses to identify any discrepancies or bugs. During Functionality Testing, different scenarios are executed to simulate real-world usage. This helps to verify that all components, such as buttons, forms, and links, perform correctly. The goal is to ensure a seamless user experience and that the software meets the needs of its users effectively.