What are Russian dolls?

Renu, I wish to bring to your notice that asking questions for which you can easily get answers from google search are not encouraged here, is, GK type of questions are not allowed. So please do not post such type of questions again.

Russian dolls are a set of wooden dolls. Their size varies from biggest to the smallest. They can be placed one inside the other. These dolls are well known with varying names like Matryoshka , Babushka doll to name a few.