The id is in the UNCONSCIOUS part of the mind, and is closely linked to biological processes and operates under the pleasure principle, therefore seeking to gratify the instincts. Freud posits two main instincts – sex and aggression. Sex expresses the life instinct (EROS), and aggression the death instinct (THANATOS).
The desires of the id cannot be met realistically, so the ego develops to ensure the energies are released in a form acceptable to society. One means of transforming the instinctual energies into acceptable forms is through DEFENCE MECHANISMS.
The id refers to one of the three essential components of Sigmund Freud‘s theory of the human personality. The id represents the primitive, animal aspect of the self that Freud viewed as constituting the core of the psyche. The other aspects of the psyche, the ego and the superego, are later developments that arise from the need to survive and to adapt to the surrounding social environment. The id, which embodies such drives as sex and aggression, is often at odds with the environment because society requires us to control our sexual and aggressive urges. The need to control and even repress these urges leads to inner conflicts—conflicts of which we are often largely unconscious and which are frequently expressed in our dreams. Repressed sexual and violent urges may lead to sexual and violent dreams.