Question

Because I don't get it

Comments

Is there anything specific that you don't get? Read these pages and say here what you don't get:
http://pokemondb.net/pokebase/837/what-are-individual-values
http://pokemondb.net/pokebase/4001/is-evs-and-ivs-same

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Yeah, it'd really help if you could name something specifically that you don't understand about IV's.

Answer 1

IVs, Individual Values, are to do with your pokemons personality, for example "Likes to run". It is shown in your pokemons summary. These Personalities can effect stats, for example, "Proud of its Power" would rise Attack more than normal. Each personality has a different IV, here is a link that shows them all:
http://pokemondb.net/mechanics/hidden