I don't know a lot about motorcycles but I have heard of Harley-Davidson 
Yeah, the Harley-Davison motorcycles are awesome. They're an American motorcycle founded in Milwaukee in 1903. My dad drives one!
Awesome! Are they the most popular motorcycle brand in the US?
Definitely! They're also one of two American motorcycle companies to survive the Great Depression. The company has been going strong for years making good bikes.
That is interesting. Is this brand common in the rest of the world?
Yes, they have factories all over the world. York, Pennsylvania; Milwaukee, Wisconsin; Kansas City, Missouri; Manaus, Brazi. Just to name a few places. They're a popular biker club motorcycle.
Who is their biggest competitor?
I don't know to be honest! Yamaha and Kawasaki both are very popular motorcycle brands. But Harley-Davidson also makes merchandise, home decor, ornaments and accessories.   
I didn't know they made so many other products. What kind of home decor?
Mugs, pillows, bed sheets. They sponsor clubs and events all over the world.