Automated functional testing is an essential process for development teams aiming to deliver high-quality web applications quickly without compromising on quality. It involves testing a web application's performance and ensuring it meets the functional requirements specified. Techniques like black box testing are used to verify various functions such as user interface, databases, and client/server communication, both manually and through automation tools. Automated tools like Selenium are widely used due to their ability to efficiently manage repetitive tests and enhance test coverage. Functional testing comprises various types, including unit, smoke, regression, sanity, integration, system, and cross-browser testing, each serving distinct purposes in the software development cycle. The article also contrasts functional and non-functional testing, emphasizing the benefits of automated functional testing in delivering bug-free, secure software. Harshit Paul, a tech blogger and product growth specialist, underscores the importance of thoroughly testing applications before market release to ensure they meet user requirements and provide a satisfactory experience.