High Quality Content by WIKIPEDIA articles! 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. Postage stamps are the most popular way of paying for retail mail, alternatives include postal stationery such as prepaid-postage envelopes, post cards, lettercards, aerogrammes and newspaper wrappers in addition to printed postal impressions and postage meters. The study of postage stamps is called philately. Stamp collecting is a hobby.