I was looking at somebody's profile on Stack Overflow, and I saw Java was one of the badges (bronze as well as silver).
I appreciate if anybody could explain how tags work as badges.
All tags have badges - click on the
Tags get have bronze, silver and gold badges - awarded to people who got 100, 400 and 1000 upvotes on 20, 80 and 200 non-community wiki answers in the topic.
These badges are called tag specialist badges.