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What creatine does:
When ingested into the body, creatine joins with a phosphate molecule to be phospho-creatine.
Your uses energy in the form of ATP (adenosine tri-phosphate). When for instance you want to contract a muslce cell, the body will use ATP to make it do that.
When ATP is 'used', it releases a phosphate molecule, and becomes ADP (adenosine di-phosphate). To be useful as an energy molecule again, it needs to gain another phosphate molcule.
The ADP borrows the phosphate molecule from the creatine stored in your cells, and reverts back to ATP much quicker than it would with supplimentation.
This allows you to get that little bit more energy at the end of your sets to get one or two more reps in.
Also, because your body can quickly build back up it's energy reserves, your recovery times drop.
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