AR replaces all screens, buttons and interfaces with holograms. In this case, a hologram can be the shiny lines you see in many sci-fi, replacing laptop screens, fiddly little interfaces for gadgets, … These things would also be great for designing stuff, teaching using proper models instead of pictures in a book.

Or it can be indistinguishable from real-life, such as having an empty paper book and have the AR glasses overlaying an e-book, such that it reads, looks, feels and smells like a classic tome. Weather predictions look like a note stuck to your door.

Then you have entertainment. That goes from table top games look like they are on the table, to running around outside casting fireballs and chain lighting.

Or it can be an ad riddled nightmare where everything you look at and your reaction is recorded and shared by corporations.