The Id is one of three parts of personality in Freud's model. It is entirely unconscious and includes instinctive and primitive behaviors. It demands immediate gratification.
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A reservoir of feelings, thoughts, urges, memories that are outside our conscious awareness but influence our behavior significantly according to Freud’s theory.
Libido: In Freudian psychology this term refers to sexual desire or drive for survival; it's energy created by survival or sexual instincts.