The Ego -- Consider the ego as the referee between both the id and the superego. The ego's job is to satisfy the id while also working within the confines of the superego. This isn't the ego in the traditional sense, but rather that component of the mind that acts as the primary driver of the psychic apparatus. Since every person is unique with unique experiences, the ego works differently in each of us.
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The ego is the driver making the decisions. It decides between the devil (the id) and the angel (the super-ego) on either shoulder (yes, all those cartoons you've ever seen are partly true). We have voices in our mind, and it's up to the ego to decide which one to fulfill. Its goal is to satisfy the id in some way while also attending to the super-ego.