Use Handoff to move seamlessly between your Apple devices. For instance, say you start to write an email message on your Mac and then have to rush out the door for work. While you wait at the train station, finish composing the message on your iPhone. Or, say you start reading an article in Safari on your iPad and then want to finish on your iMac at the office. Handoff lets you pick up where you left off when using Calendar, Contacts, Keynote, Mail, Maps, Messages, Notes, Numbers, Pages, Reminders, Safari, and some third-party apps in El Capitan and iOS 9 ①.