Final answer:
The instinct or desire to promote one's own well-being is known as self-love, which is essential for one's overall well-being and different from conceit or narcissism.
Step-by-step explanation:
The instinct or desire to promote one's own well-being is referred to as self-love. This term is distinct from conceit, which implies an excessive pride in oneself, and narcissism, which involves an excessive or erotic interest in oneself and one's physical appearance. Self-love is a basic form of self-care and respect for oneself that is necessary for overall well-being. On a related note, altruism is a form of prosocial behavior motivated by the selfless helping of others, contrasting with self-love. In psychology, the long-standing traits and patterns that propel individuals to consistently think, feel, and behave in specific ways are known as personality traits. Ethical egoism is a philosophy suggesting that individuals have a moral obligation to act in their own best interest, which might be misconstrued as self-love but fundamentally has different implications.