Definition: A rectangular piece of thick paper or thin cardboard intended to be written on and mailed without an envelope. In the case of a picture postcard one side carries a picture or photograph.

Alright class, settle down, let’s take a peek, At “postcards,” a word that’s simple and sleek! The dictionary tells us, clear as can be, It's paper or cardboard, you see. A rectangular shape, quite neat and bright, Designed for writing with all of your might! No envelope needed, it’s true, Just a message sent just for you. But wait! There's a twist, a lovely surprise, One side holds a picture before your eyes! A photograph or painting, colorful and grand, A postcard’s purpose, close at hand. Think of sending memories far away, With a picture and words to brighten the day! Does that make sense? Any questions you might pose? Let's discuss postcards – how their beauty grows!