This is a very common 0.1uF capacitor. Used on all sorts of applications to decouple ICs from power supplies. 0.1" spaced leads make this a perfect candidate for breadboarding and perf boarding. Rated at 50V.
If you need a bunch of these, you can get good bulk discounts on Digikey, part # : 399-4266-ND
Documents: Power Supply Lecture
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