Repo
/ˈɹiːpoʊ/ · Noun · Development
Definitions
Short for repository. A directory tracked by a version control system (almost always Git) that contains a project's source code, history, branches, and configuration. Used so universally that the full word 'repository' sounds oddly formal in conversation.
In plain English: A project folder whose entire history of changes is tracked by Git, the most common version control tool.
Example: "Clone the repo, check out the feature branch, and run make to build — the README has the rest."