A Full Stack Developer is a software professional skilled in both front-end and back-end development. This means they can create the visual parts of a website or application that users interact with, as well as the server-side logic that processes data and manages user requests. They work with various programming languages and frameworks to build complete web solutions. These developers are versatile and can handle multiple tasks, from designing user interfaces to managing databases. Their broad skill set allows them to understand the entire development process, making them valuable assets in software development teams and projects.