The typical Jewish hat is called a kippah or yarmulke. The word "kippah" means "skullcap" in Yiddish, the original language of Ashkenazi Jews. The tradition of wearing a kippah at all times was created thousands of years ago.
The hat is a small cap that is placed on the top of the head when worn. It can be a plain hat, but many have custom designs related to religion as well. The kippah is a sign of respect and reverence of a greater power — God. In traditional Jewish communities, boys and men wear a kippah at all times.