An interjection is a word or phrase that expresses strong emotion or feeling. It is usually followed by an exclamation point (!) and can stand alone as a sentence.
Here are some examples:
* Wow! That's an amazing view!
* Ouch! That hurt!
* Oh no! I forgot my keys!
* Hurray! We won the game!
Interjections are a part of speech that add emotion and expressiveness to our language.