Difference between ceramic and electrolytic capactiors?

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http://forum.allaboutcircuits.com – Hello I'm am trying to complete some projects using the arduino and I was wondering if I am able to use electrolytic capacitors in place of ceramic capacitors? In the schematics there are cermaic capacitors and I only have electrolytic capacitors. If anyone could tell me if my projects will still work with my capacitors and what the difference is that would be great. Thanks in advance!! (Embedded)