Web development is the practice of building and maintaining websites or web applications for the internet or intranets. It involves a range of tasks and skills, from creating simple static web pages with HTML and CSS to developing complex, interactive, and data-driven websites using a variety of programming languages, frameworks, and libraries. Web development is usually categorized into two main domains: front-end development, which deals with the visual elements and user interfaces that the end-user interacts with, and back-end development, which focuses on server-side operations, databases, and application logic. Many developers specialize in one area but some, known as full-stack developers, are proficient in both. Modern web development has also come to embrace a variety of other roles and technologies, including but not limited to UX/UI design, content management systems, version control, and DevOps practices. With the advent of mobile devices, responsive design and progressive web apps have become increasingly important. Likewise, web accessibility and performance optimization are gaining attention as critical factors in delivering quality user experiences. The field is continuously evolving, driven by the rapid pace of technological advancements like new web APIs, cloud computing, and real-time communication.