A web developer is responsible for designing, developing, and maintaining websites and web applications. Their work involves using programming languages such as HTML, CSS, and JavaScript to create the visual layout and functionality of websites, as well as back-end programming languages such as PHP, Ruby, and Python to develop the server-side of web applications.

In addition to coding, web developers may also be responsible for testing and debugging websites, optimizing website performance, and ensuring that websites are compatible with different browsers and devices. They may also collaborate with designers and content creators to ensure that the website meets the client’s requirements and expectations.

Overall, web developers play a crucial role in creating and maintaining the online presence of businesses, organizations, and individuals.