Have you found something online that interests you - a puppy, a car, an apartment for rent or any item for sale? Does the price for the item seem to be too good to be true and are you being asked to pay by some form of cash, money order, prepaid card or money transfer?
Unfortunately, this is a SCAM. Do not send money for the item to the seller. They may even send you a letter or e-mail of authentication telling you that you have purchased the item but need to wire funds first. Do not send the money. It is a SCAM. You will receive no merchandise. Once money is wired and received or money orders/prepaid card sent and cashed out, they cannot be recovered.