Web development entails the creation and upkeep of websites and web applications. This encompasses designing, coding, and organizing elements like layout, content, and functionality within a site. This process encompasses both the front-end, responsible for user interface and experience, and the back-end, handling server-side logic and databases. Web developers use programming languages like HTML, CSS, and JavaScript, along with frameworks and tools, to build responsive, interactive, and dynamic online platforms that cater to various purposes, from informational sites to e-commerce platforms and complex web applications.