What is the difference between a crystal and a ceramic resonator?

Someone told me that this is a crystal resonator.??
http://mikescomputers.homeip.net/DSC00347.JPG

I don't know if the one I have has a cap or not in it and I can't seem to
find any info on the part.. It lists its frequency 24.000 and then it lists
something else KDS 2K

Would this be the same as the one in the picture?
http://tinyurl.com/r88sd
http://www.digikey.com/scripts/DkSea...182101&Site=US



Thanks,
Mike