Which command is used in Git to save changes to the local repository?

The command used in Git to save changes to the local repository is "commit." When you make changes to files in your working directory, those changes are not automatically recorded in the repository. The "commit" command allows you to take a snapshot of your changes along with an optional message describing the changes. This snapshot is then stored in the local repository history, which you can reference later.

Using "commit" is crucial because it provides a record of what has been changed over time, allowing developers to revert to previous states of the project if needed. This command captures the current state of the file(s) you've modified and saves them as part of the project's history.

In contrast, the other options serve different purposes: "push" is used to send commits from the local repository to a remote repository; "merge" combines changes from different branches, and "pull" fetches and incorporates changes from a remote repository into the local branch. All these commands operate within the lifecycle of version control but do not directly save changes to the local repository in the manner that "commit" does.