Who is Mr Hyde and why is he so important in the novel "The Strange case of dr Jekyll and mr Hyde"?

Mr Hyde is Dr Jekyll but like the dark side of him. The novel represents a concept in Western culture, that of the inner conflict of humanity's sense of good and evil. Dr Jekyll is a doctor who has covered up a secret life full of bad and cruel deeds. He feels as if he is always fighting within himself between what is good and what is evil, and is pushing away people dear to him. After drinking a potion of his own creation, Jekyll is transformed into the cruel, remorseless, evil Edward Hyde, representing the hidden side of Dr. Jekyll's nature brought to the fore. Dr. Jekyll has many friends and has a friendly personality, but in the nature of Hyde, he becomes mysterious and secretive.