What is the difference between discourse analysis and critical discourse analysis?

It is a concept that is related to and different from language, discourse system, speech environment, speech and text.

Discourse analysis is a branch of linguistics, involving philosophy, sociology and cognitive science. The formation of critical discourse analysis emphasizes "criticism", that is, it implies the power relations and ideology that are used to in social life. This paper summarizes the origin, purpose, definition, development and application of "comment on writing", as well as the theoretical framework for realizing the original purpose of "comment on writing", and also puts forward its limitations.