Creatine vs creatinine function?

Question

what is the different between creatine and creatinine? how are they made differently?

Answer 1

Creatine:

a compound formed in protein metabolism and present in much living tissue. It is involved in the supply of energy for muscular contraction.

Creatinine:

a compound that is produced by metabolism of creatine and excreted in the urine.

From the definitions alone, creatine helps in building muscle mass by supplementing readily available energy for muscle contraction during excercise. Creatinine is a product from the reaction of creatine in the body.