Android 5 Lollipop is a big release. So many new features has been added.
1. Metallic Graphics has been supported.
2. Improvement and new feature in Notification.
3. Support for 64-bit system.
4. Different New API for Camera and browser.
5. Multiple network connection by app.
And so many new features and API has been added in Android 5 Lollipop which is not present in Android Kitkat.
Find some link