Git Merge vs. Git Rebase

git merge and git rebase both integrate work from one branch into another, but they do it by changing history in different ways. The safest way to think about them is this: merge preserves the original branch structure, while rebase rewrites commits so they appear to have been created on a new base.

Assume main has commits A-B-C and your feature branch has D-E, created from B. By the time you are ready to integrate, main has advanced to C.

What merge does

If you check out main and run git merge feature, Git creates a new merge commit that has both histories as parents. The result looks conceptually like A-B-C-M, where M ties together C and E.

The advantage is safety and traceability. Merge is non-destructive because the existing commits remain exactly as they were. This makes it well suited to shared branches and collaborative work where several people may already have based work on the existing history. A merge commit also records that two lines of development were combined at a specific moment, which can be useful when reading history later.

The downside is history shape. Frequent merges can produce a graph that is harder to scan, especially in busy repositories with many short-lived branches. That clutter is mostly cosmetic, but it does affect how easily humans reason about the timeline.

What rebase does

If you check out the feature branch and run git rebase main, Git takes commits D and E, replays their changes on top of C, and creates new commits, often described as D' and E'. The feature branch now looks like A-B-C-D'-E'.

The benefit is a linear history. Logs are easier to read because the feature appears as if it started from the latest main. This can make bisecting, reviewing, and following a change series simpler.

The cost is that rebase rewrites commit identity. Even if the code diff is identical, D' is not the same commit as D. That matters whenever the original commits are already visible to other developers.

Why conflicts feel different

Both commands can surface merge conflicts. With merge, you typically resolve conflicts once at integration time. With rebase, Git may stop on each replayed commit that conflicts with the new base. This can be more work, but it also forces you to resolve conflicts in the context of each original change, which sometimes produces a cleaner series.

The golden rule of rebase

Do not rebase public history that other people may already have pulled. If you rebase a shared branch, everyone else's local copy still points at the old commits. The next push or pull becomes confusing because Git sees two competing histories that contain similar changes with different commit IDs.

That is why rebasing local feature branches is common, while rebasing main or a shared release branch is usually a bad idea. Private history is yours to tidy. Shared history is a contract.

When to prefer each one

Choose merge when you want the safest option, when the branch is already shared, or when preserving the exact development graph is useful.

Choose rebase when you want a clean linear feature history before opening a pull request, or when you are updating your private branch on top of a moving main branch.

A practical compromise is common in many teams: developers rebase their own feature branches locally to keep them current, then the repository merges the reviewed branch into main using either a merge commit or a squash merge. That keeps local work tidy without rewriting published team history.