I've heard lots of explanations about this, from: Helping aid scorekeepers to identify players, helping referees and umpires identify players, keeping uniforms separate...
But I'm sure there's some "official" reason as to why jerseys and uniforms have to have numbers on them.
She used to run a deal website with a friend of hers. He left and made another deal website, and now he's decided to hack into the old website and steal it back for himself.
My friend doesn't know what to do, she's losing money because he now has his google adsense rigged up to make money on...