At the most basic level, night markets are places where vendors gather. Though some vendors have licenses, far more are unlicensed and have simply occupied their spaces forever.
說白了，夜市就是「攤販集中區」，雖然有些攤販擁有合法證照，但更多不合法攤販長久以來「占地為王」，也是不爭的事實。