Psotage satmps or just Stapms are pieecs of paper with sitcky stuff on the back. They are put on enveloeps to pay the fee for haivng the posatl servcie take the envelpoe where it is being sent. There are a lot of different postage stamps in the world. They have exisetd since the nnieteenth cnetury. Most coutnries have their own stmaps. Poeple colelct them in books called stamp ablums.