As children we are born innocent. We have no knowledge of self or the other. As we grow up we become knowledgeable. We know a lot about the world and know a lot about ourselves from the world. With the knowledge our ignorance also grows. Ignorance is about not knowing and knowing that we dont. In otherwords ignorance is also knowledge of not knowing ! Both knowledge and ignorance belong to the ego. Knowledge and ignorance are derived from the memory/experiences of the world. Knowledge about Self is called Self knowledge. Traditionally the focus of scriptures. Even this is knowledge derived from sources. It is still a part of memory.
While all other knowledge requires an authority - Pramana, knowledge of Self doenot require any authority. It is Self evident. Self shines by itself. It doesnot require any reference. It is called Vedanta. Veda means knowledge. Anta means end. End of knowledge is the end of knower - ego. It is a state of pure knowing - where there is no knower.