The best way to present the idea of TripleClicks TCredits to someone who has never heard of them is to talk about it.
Explain what TripleClicks TCredits are by comparing it to real currency.
Explain that TCredits are the virtual currency used in TripleClicks Store.
Then walk with him/her through our TripleClicks Store.
Explain the similarity of going shopping in the real world and buying and paying for cash for the purchases. When someone shops in our TripleClicks Store, he pays not with cash but with TCredits.