https://blog.gongquiz.com/2021/10/14/%eb%8c%80%ea%b8%b0%ec%97%85-vs-%ec%8a%a4%ed%83%80%ed%8a%b8%ec%97%85-%ec%96%b4%eb%94%94%ec%97%90-%ec%b7%a8%ec%97%85%ed%95%98%eb%a9%b4-%ec%a2%8b%ec%9d%84%ea%b9%8c-%ef%bf%a0/