Most people have at least 3 to 5 rewards cards in their wallets. You earn points for buying groceries from different supermarkets, for booking flights on various airlines, for purchasing anything at department stores, when loading gas or buying medicines. Even the simple act of buying coffee and pizza can earn you points that you can eventually redeem. The key word is eventually because it can take a while for those points to add up and amount to something. Most of the time, they just expire without you knowing and you end up not ever redeeming anything.