5 (a) The Id
The id is the only component of personality that is present from birth. This aspect of personality is entirely unconscious and includes of the instinctive and primitive behaviors. According to Freud, the id is the source of all psychic energy, making it the primary component of personality.
The id is driven by the pleasure principle, which strives for immediate gratification of all desires, wants, and needs. If these needs are not satisfied immediately, the result is a state anxiety or tension. For example, an increase in hunger or thirst should produce an immediate attempt to eat or drink. The id is very important early in life, because it ensures that an infant's needs are met. If the infant is hungry or uncomfortable, he or she will cry until the demands of the id are met.
However, immediately satisfying these needs is not always realistic or even possible. If we were ruled entirely by the pleasure principle, we might find ourselves grabbing things we want out of other people's hands to satisfy our own cravings. This sort of behavior would be both disruptive and socially unacceptable. According to Freud, the id tries to resolve the tension created by the pleasure principle through the primary process, which involves forming a mental image of the desired object as a way of satisfying the need.