Meaning of the word "postage stamp" in English

What does "postage stamp" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

postage stamp

US /ˈpoʊ.stɪdʒ ˌstæmp/
UK /ˈpəʊ.stɪdʒ ˌstæmp/

Noun

a small adhesive piece of paper, issued by a postal authority, to be affixed to a letter or parcel to indicate that postage has been paid

Example:
I need to buy a postage stamp for this letter.
Collecting old postage stamps is a popular hobby.