At a high level, creatine retains water in/around your muscle (depending on the strand) and allows your muscles to easily grab the water to replenish themselves. It also increases how many satellite cells donate themselves to improve muscle hypertrophy. Allows you to push a bit further and helps muscle grow. Strength generally only improves about 5% from creatine, but that's quite a bit when you're pushing for that last rep.
"Is it just me or does Werdum look like the kind of guy that would fuck a tranny without a second thought? Seriously, everytime I look at his face I think, "Yeah, hes fucked a tranny or two"" -sc_syne