A web developer is a professional who creates and maintains websites. They use programming languages like HTML, CSS, and JavaScript to build the structure, design, and functionality of a site. Web developers can specialize in different areas, such as front-end development, which focuses on what users see, or back-end development, which deals with server-side operations and databases. In addition to coding, web developers often collaborate with graphic designers and content creators to ensure that a website is visually appealing and user-friendly. They also test websites for performance and troubleshoot any issues that arise, ensuring a smooth experience for visitors.