git pull and git fetch are both Git commands used to retrieve updates from a remote repository, but they differ in how they integrate those updates into your local branch.

1. git fetch:

2. Fetches changes from the remote repository to your local repository.

3. Downloads new branches and data, but does not automatically merge or modify your working directory.
4. Saves the updates from the remote repository in your local repository, allowing you to review changes before merging.
5. You need to manually merge the changes using git merge or git rebase.

git fetch origin

1. git pull:

2. Fetches changes from the remote repository and automatically merges them into your current branch.

3. Essentially a combination of git fetch followed by git merge (or git rebase, depending on your configuration).
4. Convenient for quickly updating and merging the changes from a remote branch.
5. May result in automatic merges, and you may need to resolve conflicts.

git pull origin master

When you use git fetch, you get an overview of the changes fetched from the remote, and you can decide when and how to integrate those changes into your local branch. It is considered a safer option as it doesn’t automatically modify your working directory or perform merges.

On the other hand, git pull is a more convenient command if you want to quickly update your local branch with the changes from the remote branch and don’t mind automatic merging. However, it might lead to conflicts that need to be resolved manually.

In summary, use git fetch if you prefer more control over the merging process or want to review changes before merging. Use git pull if you want a quick way to fetch and automatically merge the changes from the remote branch.