It is written in a stupid way with lots of words without real content, but I think it actually has a paragraph that explains the problem quite well to "OMG - LOL" crowd:

P and NP are both a collection of problems whose solutions are “fast.” The question of P versus NP revolves around whether for all problems that a computer can quickly verify a solution (NP), if it can also quickly find a solution (P). We know that if we have quickly found a solution that we can quickly verify it, so P problems are a subset of NP ones. But the P versus NP problem asks the reverse (sorta): can something be easy to verify, but hard to solve? Are P problems always NP problems? Does P equal NP?