Free Information Android runtimes

A runtime can in simple words be explained as how a computer deals with apps etc.
There are two android runtimes existing:
- Dalvik (all android devices so far have used this runtime)
- ART (this is a new system that will be implemented in android 5.0)

Those of you who are using android KitKat can go to developer options and change the runtime to ART from Dalvik.

So what's the difference?

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