iOS 8 Handoff
In iOS 8 switching between your iPhone and computer or iPhone and iPad to do finish a task like an email or editing a document is easier.
On iOS 7 you would need to save and share the file to your other device manually. Then find it and open it on the device to get started.
With Handoff on iOS 8 and OS X Yosemite it is easy to quickly jump from iPhone to iPad to computer and stay in the same document, web page or app.