Front-end development is a branch of web development that focuses on the development of the client-side of web applications, such as the user interface, the user experience, and the interactivity, using various web technologies, such as HTML, CSS, JavaScript, and frameworks, such as React, Vue.js, or Angular. Front-end development involves various skills, such as design, coding, testing, debugging, and optimization, and requires a deep understanding of web standards, accessibility, performance, and security. Front-end development can also involve collaboration with back-end developers, designers, or stakeholders, and can have a significant impact on the success of web projects.