postcard
/ˈpoʊstˌkɑrd/
noun
- A small card with a picture on one side, sent by mail without an envelope, often from a vacation or place of interest.
- I collect postcards from every city I visit.
- She sent a postcard of the Eiffel Tower to her grandmother.
- He wrote a quick message on the back of the postcard and dropped it in the mailbox.