K-Pop has a variety of different elements and is a music genre from Korea.
I have never heard of it before. Has it ever been to the States
Yes, there are a few K-Pop songs that I have heard good big in the USA. It is the most popular in South Korea and has Western elements of pop.
Can you recommend one of the songs for me to try? 
I'm not sure of a specific song, but the group BoA has some famous stuff from what I can gather from 2003 and onward.