Samsung SCH-I515MSAVZW - Manual (Page 43)

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Optimize memory usage
You typically don't need to worry about managing apps beyond installing, opening, and using them. But
there may be times when you want to know more about what's happening behind the scenes.
Apps use two kinds of memory: internal storage and RAM. They use internal storage for themselves and
any files, settings, and other data they use. They also use RAM (memory designed for temporary storage
and fast access) when they're running.
Android manages and carefully guards the portion of internal storage where the system, apps, and most
data for those apps are stored, because this area may contain your private information. It's not possible
to view this portion of internal storage when you connect your device to a computer with a USB cable.
The other portion of internal storage, where music, downloaded files, and so on are stored, remains
visible for your convenience.
Android also manages how apps use RAM. It may cache some things you've been using recently, for
quicker access if you need them again, but it will erase the cache if it needs the RAM for new activities.
You affect the way apps use internal storage directly and indirectly in many ways; for example, by:
G Installing or uninstalling apps.
G Downloading files in Browser, Gmail, and other apps.
G Creating files (for example, by taking pictures).
G Deleting downloaded files or files you created.
G Copying files between your device and a computer via USB or Bluetooth.
You rarely need to manage the way apps use RAM. But you can monitor apps' RAM usage and stop them
if they misbehave.