Did Sigmund Freud focus on the subconscious?

Freud was the pioneer of the Psychoanalytic approach. He was amongst the first to identify a deeper level of processing in the mind. He argued that many experiences could accumulate in this sub-conscious level of thought, and that these would later affect our thoughts without us directly knowing about them or their influence. The answerer before me claimed that Freud introduced the Id and the Ego here, which is an easy mistake, but these are actually products of the unconscious mind, according to Freud.