Handoff lets you continue your current task on another device, from where you left off (it hands off the task). So if you have a text document open or you're wr

Handoff lets you continue your current task on another device, from where you left off (it hands off the task). So if you have a text document open or you're writing an email on a mac, it will let you continue doing that on an iphone, with the text you entered on the mac already being there. You can also make calls or send texts from a mac if your iphone is nearby.