There’s still something kinda magical-feeling about printing documents from your iPhone. Maybe someone sends you a long Word or Pages document that you prefer to read on paper. Or maybe you must sign a hard-copy version of a PDF and send it back via real paper mail.
You may be used to facing a task like this in your iPhone’s email app, and putting it off until you get to your Mac or PC. But chances are, if you own a fairly modern printer, you can just print right from the iPhone. In fact, once you get a taste for it, you’ll prefer printing from iOS. You will never need to deal with drivers, or pick up your 100-page print job only to find every sheet printed too small.
The answer is AirPrint. It’s how printers always should have worked.