Branching is the practice of creating a separate line of work in a version control system like Git so developers can implement, test, and review changes without impacting the primary branch used for releases. It solves the problem of multiple engineers working in parallel by isolating features, bug fixes, and experiments into dedicated branches, each pointing to a specific commit (a saved snapshot of the code) and moving forward as new commits are added. With Branching, teams can validate changes and merge them through a controlled integration step, resulting in fewer broken builds and more predictable deployments; without it, everyone commits directly to the main line, increasing conflicts, unstable releases, and time spent recovering from regressions. This gap exists because isolation lets you choose when and how changes are integrated, so verification happens before shared environments and users are affected.