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Android 4.3 includes some security features lacking in previous versions of Google's mobile OS:
"Perhaps the biggest enhancement to Android with the release of 4.3 is the addition of restricted user profiles. This feature allows an Android owner who shares his or her device with others to control the usage of applications and other content. ...
"The new version of Jelly Bean includes an extension called SELinux (Security-Enhanced Linux), a modification to the kernel that allows detailed mandatory access control policies."
Also, 4.3 reportedly extends battery life.