Can I delete .git folder in a completed WP project?

I manage a WP-based site with a custom theme built by a developer to whom I no longer have access. I am currently backing up the WP files via FTP and am curious about the presence of .git files in our theme folder. There are hundreds of sub-folders containing dozens of files each. Can anyone advise me if it is necessary to maintain that .git folder or is that purely a development tool?

Topic backup Wordpress

Category Web

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