When you share a file on Google Drive, you can choose the permission level for each person. If you give someone "viewer" permission, they can see the file, but can't edit it. However, they can download a copy of the file to their own device, which is totally convenient!
This feature is a total game-changer for collaboration and file-sharing. Imagine being able to share a document or presentation with someone, and they can access it from anywhere, without needing to ask you for permission. It's so much easier than emailing files back and forth or using a flash drive!