Android has reached to its current peak position in the mobile market by three factors -
1. Open Source to work.
2. Google's backing.
3. Application Ecosystem.

Recently, Google has launched new version of Android, Name, Android 5.0 Lollipop. The major change in Android 5.0 is the overall design of the OS, accompanying under several important factor like performance, stability and battery life. Top 5 changes:

1.Material Design

Its a brand new regime for designing. Material design is more focused on animation occurs on the screen, this simply if I say then everything is animated. It provides a presentation without breaking the continuity of the user experience. It utilizes the layered user interface and give a dynamic look .

2.Android Runtime

Android Lollipop switches over to a fabulous new application run time, also called as Android Runtime and Art in short. Google introduced Android Runtime in 4.4, it has went through various changes to look like what it is now. The all new Android Runtime has AOT that is Ahead of time approach that helps in reducing the time for launching applications, CPU usage, RAM usage to make it run more smoother, faster and efficient than Android 4.4.

3.Revamped Notifications

Notification system is completely revamped now. Google introduced Lockscreen Notifications in this Operation System, so that you can take a quick glance.

4.Project Volta

Project Volta is related to improve your devices battery usage as it has two important parts such as Battery Saver Mode and Battery Historian. Battery Saver Mode turns animation Off, reduces screen brightness, underclocks CPU and GPU to save battery. Its a user end feature. Battery Saver Mode is a developer oriented tool, allow developer to track so many things like Device wakelocks CPU usage other battery parameters over through ABD and PC.

5.Improved Security

Huge focus on improved security. Done huge number of things that makes your device more secure. Android 5.0 Lollipop have kill switch. If any case your device is stolen, it will useless if you cannot unlock it. Android 5.0 Lollipop introduced full SELinux Support with enforcing set as default in kernel. Introduced feature of face recognizing based unlock for specific users.