Factory reset

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http://forum.xda-developers.com – Hi, i have/was having problems with tablet not waking up from sleep (lock) and also had a first known reboot out of the blue yesterday. So, i first tried with cold boot, but didn't help. Now i have factory reset the tablet, but the weird thing is that my boot animation is same as before, also the apk for google search > google now (which i was tried weeks ago) is still present. I had an impression that the factory reset - well, resets the tablet. But can someone please explain what does it actually, specially i need an answer on why the boot animation didn't go back to stock etc... (HowTos)