What is the purpose of the user/pack directory?

I’ve been looking at LibreOffice user profile - The Document Foundation Wiki, but did not find a note on the user/pack directory. It contains a similar hierarchy as user/ itself, and all the files in this directory are “Git pack” files (as determined by running the file command).

Can anyone please explain what these files are? Some kind of version control? If I remove them, am I likely to run into trouble? Just curious…