When working collaboratively, there's nothing more important than your ability to quickly and easily share files. As its name suggests, SharePoint allows users to share files with others whilst keeping those files in a central location.
Conventional file sharing, by attaching files to email, normally means lots of versions of files in different locations - it's a headache to combine all the edits and comments. But multiple users working on a single, central file, make edits and comments much easier to track and manage.
SharePoint also keeps a version history, so you can restore previous edits if needed.
If you're interested in more file-sharing tips, you might find our tip on attaching files to teams meetings useful.