Well-being asks what makes a life go well for the person living it. Philosophical accounts include pleasure, fulfillment of desires, and objective goods such as knowledge or relationships. This differs from asking whether the person is morally admirable or whether their life benefits other people.
Well-being is about what makes life go well for the individual living it. Enjoyment, fulfilled desires, relationships, knowledge, and achievement are candidates, but theories disagree about which are fundamental. A person can desire something harmful, enjoy a false belief, or fail to appreciate something valuable. These possibilities separate what feels good, what is wanted, and what might actually benefit someone. Any practical appeal to welfare should state which account it uses and why.