Most people start a collection for the pleasure and education just like any other hobby, but this hobby offers a financial reward as well, as collections experience a steady increase in value over the years.
A postage stamp is adhesive paper evidence of a fee paid for postal services. Usually a small rectangle attached to an envelope, the stamp signifies the person sending it has fully or partly paid for delivery. The study of postage stamps is philately. Stamp collecting is the hobby of collecting stamps. Source: Wikipedia.