What is the second belt in karate?

Answer 1

Blue-Advanced, usually. Depends on stuff like your country, teacher, style, and method.

In my dojo, orange was the third belt color for adults but children had yellow. Depending on the style and your sensei and the country, it could be yellow, orange, blue, or a color with a white stripe.

Answer 2

It depends on the school, some have yellow, then orange. Some schools have a white belt with a black stripe down the middle. Some schools have white with yellow ends, or orange stripes.