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Hi Joorge,
The yellow ones are probably multilayer polyester film capacitors and are typically a higher voltage rating & are better for high frequencies. However they are larger than electrolytics for the same value.
Electrolytics as their name implies are fluid filled.
This is straight from wiki:- http://en.wikipedia.org/wiki/Capacitor
An electrolytic capacitor is a type of capacitor that uses an ionic conducting liquid as one of its plates with a larger capacitance per unit volume than other types
 
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