SDL & Qt


Could someone tell me what SDL and Qt are, please? I have installed C4Droid on Android my mobile phone, and I'm trying to conserve memory on my ZTE Blade. What do these optional add-on's do, and are they necessary, please?

(They have installed okay, I just don't know if I really, really need them)

Thank you for any advice. :-)
Qt can be used for making GUIs.
SDL can be used to show graphics, play sound, handle input, etc. Mostly used by games.
Thanks Peter, for both your advice and the quick response. :)
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