What is a common use for the Git command `git merge`?

The Git command git merge is primarily used to combine changes from one branch into another. This operation is essential in collaborative workflows where multiple contributors might be working on different features or fixes in separate branches. When performing a merge, Git integrates the changes made in the source branch into the target branch, allowing all the updates and modifications from both branches to coexist.

Understanding how merging works can help you manage your project's history and development effectively. For example, if you have been working on a feature in a separate branch and want to incorporate these changes into the main branch, you would use git merge. This command analyzes the commits from both branches, identifies any changes, and attempts to create a new commit that includes the contributions from both sources.

The other choices do not accurately represent the function of the git merge command: deleting a branch is handled by a different command, reverting changes is accomplished with commands like git revert, and examining commit history is done using git log. Thus, the option describing the merging functionality correctly identifies the purpose of git merge.