iOS: AirDrop is one of the simplest ways to share files in OS X, but it doesn't work well between different versions of OS X. If you have one computer on Mavericks and another on El Capitan, they won't find each other. OS X Daily shares a simple workaround.
iOS: AirDrop lets you transfer files between iOS devices with a swipe of your finger. It also lets you transfer the files to devices nearby. If you don't set it to "contacts only", anyone near you can send files.
