国庆节源于中华人民共和国成立的日子，即1949年10月1日。这个节日是为了庆祝中国人民在中国共产党的领导下，经历了长期的斗争和牺牲，最终赢得了国家独立和人民解放的伟大胜利而设立的。

National Day originated from the establishment of the People's Republic of China on October 1, 1949. This holiday is to celebrate the great victory of the Chinese people's independence and liberation under the leadership of the Communist Party of China after long-term struggles and sacrifices.