Farce derives from a theatrical style called vaudeville, which is typically a light or satirical comedy. Vaudevillian plots centered on society and its political, religious and moral failings.
Light on character development, farce and vaudeville use easily identifiable characters, common language, physical comedy (and for vaudeville, popular songs) to create easy-to-understand performances intended to entertain unsophisticated audiences.
Source: The Oxford Companion to the Theatre; and Pronko, Leonard. Eugene Labiche and Georges Feydeau.