Git is a version control system that tracks changes to files and allows collaboration. It keeps track of the entire history of changes to a project. The basic terminology includes repository, which stores project changes in folders; commits, which record changes with unique IDs; and branches, which allow parallel development. GitHub is a remote repository hosting service that allows pushing local repositories to the cloud. The document outlines how to initialize a local Git repository, add and commit files, connect the repository to a remote GitHub one, and push changes to share them.