Web development involves designing and building websites for the internet or intranet. It may include activities like web design, content creation, client communication, scripting, security configuration, and e-commerce development. Teams can range from a single person to hundreds of developers. Web development is used by businesses to sell products and services online and by educational institutions. It allows worldwide audiences to access content through different devices like mobile phones and tablets. The future of web design involves creating accessible and optimized experiences across various platforms and screen sizes.