I used to have the biggest collection of Barbie dolls when I was a wee lad.
what type of doll is Barbie dolls?
Barbies are a fashion doll created by Mattel.
what are they used  for?
They are toys or collectibles. They've been a critical part of the toy market for over 50 years.
where can i buy them ,i think my kids would love it?
You can buy them in any toy store. I would buy them soon, since Barbie sales have been declining since 2014.
do they come in different types and colors?
They do. They have all sorts of different accessories, clothing, and family members such as the male doll, Ken.