Part of macOS
FinderFinder
○ Leave it
Your files, folders and desktop.
What it is
The app that shows your files and draws the icons on your desktop. macOS keeps it running at all times.
If you stop it
macOS reopens it straight away. Use Force Quit only if Finder has stopped responding.
The verdict
○ Leave it. Part of macOS, or something that starts again by itself. You never need to close these.
In Activity Monitor
Finder
From Procession’s guide, in the words the app shows.