A Full Stack Developer is a professional who has expertise in both front-end and back-end web development. They are capable of working on the entire web development stack, which includes:

1. Front-end Development: This involves working on the user interface and user experience of a website or web application. Full Stack Developers are skilled in HTML, CSS, and JavaScript, as well as various front-end frameworks like React, Angular, or Vue.js. They ensure that the website is visually appealing, responsive, and user-friendly.

2. Back-end Development: Back-end development deals with server-side logic and database management. Full Stack Developers are proficient in server-side programming languages such as Python, Ruby, Java, Node.js, or PHP. They work on server configuration, database design, and implementing server-side functionality.

3. Database Management: Full Stack Developers have knowledge of databases, including SQL databases like MySQL, PostgreSQL, or NoSQL databases like MongoDB. They can design and manage databases to store and retrieve data efficiently.

4. Version Control: They use version control systems like Git to manage code repositories, collaborate with other developers, and track changes to code.

5. Deployment and DevOps: Full Stack Developers are often responsible for deploying web applications to production servers. They may also have some knowledge of DevOps practices to automate deployment processes and ensure the application’s stability and scalability.