Answer: Functional testing services involve evaluating a software application's functionality against the defined specifications and requirements. The primary goal of these services is to ensure that each function of the software operates according to the expected behavior. Functional testing covers various aspects, such as user interface, APIs, databases, security, and overall application behavior. These services are essential in software development because they help identify defects early in the development process, ensure software quality, and improve user satisfaction by delivering a product that works seamlessly as intended. By leveraging functional testing services, companies can reduce the risk of releasing faulty software and enhance the application's reliability and performance.