Pom-a-what’s it’s name?

I was walking down the street today and I came across this add for extra’s pomegranate berry gum. It sounds great and I’m sure I’m going to give it a try but it raised a question for me. What is a pomegranate, is it a berry too, is it a citrus fruit? I mean I know what it is, I’ve eaten many in my life, but what category of fruit can you classify it under?

CC