Application developers rarely work alone. Large web/cloud/mobile development and data science projects will include many people – front-end developers, back-end developers, database administrators, repository administrators, and others. Every change by every contributor must be tracked and controlled to enable collaboration, accountability, and version management. This type of distributed version control is extremely important when managing both small and large software projects. In this module, you will learn about some of the popular version control tools, create a GitHub account, and use the GitHub web interface to create a repository, add a file to it, and commit your changes. Branches are the heart of workflows in Git-based version control systems like GitHub. You will also become familiar with creating and using branches and merging your changes to the main branch.