Cotton candy (or "vattacukor" as we call it) is not a typical Hungarian food, and not healthy, but very popular in Hungary. To be honest I dont'like it, but my children and my husband like it vey much.
Cotton candy or candy floss is a form of spun sugar. Since it consists of mostly air, servings are large. Many people consider eating cotton candy part of the quintessential experience of a visit to a funfair or circus. But in Hungary you usually can find it in and any vendors on the beach and in the zoo, too.