In software development, a branch is a separate copy of a codebase where developers can work on new features or fixes without affecting the main code. Think of it like making a photocopy of a document to try changes before modifying the original. Developers create branches to experiment, add features, or fix bugs in isolation. Once changes are tested and approved, they can be merged back into the main branch. This system allows multiple developers to work simultaneously without interfering with each other. Version control systems like Git manage branching, making it essential to modern software development including government digital services.