Entropy measures the amount of disorder in a system. Nature
tends towards disorder, so as time elapses, entropy naturally
increases. Energy is required in order to decrease entropy.
Entropy, when I think of entropy I think of my four year old
daughter, if she comes into her room no matter how clean it is,
pretty soon it's chaos and disorder and we've got to go in there
and kind of fix everything up and kind of straighten it out so
basically entropy is the amount of disorder within a system.  So
let's look at an example of entropy, let's say I've got water
and I've got that water frozen in a nice little ice cube okay
and this ice cube has a lot of order and a lot of structure and
all these molecules are held together in these very tight
precise bonds okay, now if we let that ice cube melt, it's going
to gain entropy it's starting to gain energy and it's starting
to move around and it's losing that order and that structure
it's moving towards disorder and so now our ice cube, I'm going
to put it in a little c