GitHub is a web-based platform that allows developers to work collaboratively on software projects. It provides a powerful version control system for tracking changes to code and enables developers to easily collaborate with others on projects. GitHub offers a wide range of features including issue tracking, code review, and project management tools. It is widely used by developers and organizations, both large and small, to host and manage their code repositories. Overall, GitHub is a highly useful tool for developers that helps to streamline the development process and improve collaboration.