A Full Stack Developer is a software professional skilled in both the front-end and back-end aspects of web development. This means they can create the visual elements of a website that users interact with, as well as the server-side logic that powers the application. They work with various technologies, including HTML, CSS, JavaScript for the front-end, and Node.js, Python, or Ruby for the back-end. These developers are versatile and can handle all layers of a web application, from the user interface to the database. Their broad skill set allows them to understand and manage the entire development process, making them valuable assets in tech teams.