"Hey! Dude! What's an interjection?"
As I knew that the young voice was addressing me I turned around, and sure enough I was being asked a what an interjection was. I explained. It was understood.
As I walked away I remember how I learned what an interjection was. I was a young lad watching Saturday morning cartoons. Schoolhouse Rock taught me a lot of things through song. I was quite the follower. I went to YouTube and found it. So as a reply to all students here is a little video that will help you understand, in a very fun way, what an interjection is. Just click on the title.