GitHub is a web-based platform that allows developers to host, manage, and collaborate on software projects using Git, a version control system. It provides tools for tracking changes, managing code repositories, and facilitating teamwork among developers, making it an essential resource in the software development community. With features like pull requests, issues, and project boards, GitHub enhances collaboration and streamlines the development process. It also supports open-source projects, enabling developers to contribute to a vast array of software initiatives, fostering innovation and community engagement in the tech world.