What's the difference between folk songs and pop songs? Do folk songs mean folk rock?

Folk songs: Popular folk songs full of ethnic colors are called folk songs or ballads. Folk songs have a long history, so most of their authors are unknown. Folk songs are rich in content, including religion, love, war, labor, drinking, dancing, festivals and so on. Folk songs not only express a nation's feelings and habits, but also have their own unique scales and emotional styles. For example, the prosperity of French folk songs, the enthusiasm of Italian folk songs, the simplicity of English folk songs, the indignation of Japanese folk songs, the wildness of Spanish folk songs and the tears of China folk songs all show strong national temperament and color. Pop songs: Pop songs (pop songs). Sometimes it can be abbreviated as pop). The accurate concept should be commodity songs, that is, songs created for profit. It is a commercial music entertainment and all the "industrial" phenomena related to it. Its commerciality is primary and its artistry is secondary. Folk songs are folk rock. 、