What does Aristotle mean by 'the art/science of Happiness'?

Aristotle conceptualizes happiness as the ultimate goal or the highest good for human beings. In his works, particularly in "Nicomachean Ethics," he argues that all actions and pursuits are aimed at achieving happiness, which he refers to as eudaimonia. This notion of happiness transcends mere pleasure or transient emotions; it encompasses a fulfilled and virtuous life where one exercises reason and achieves moral excellence.

By identifying happiness as the ultimate goal, Aristotle emphasizes that it is not just an isolated emotion or a simple achievement but rather a comprehensive state of well-being achieved through living virtuously and realizing one's full potential. In this view, every other action or pursuit in life, whether it's acquiring knowledge, cultivating relationships, or achieving success in various endeavors, ultimately leads back to the pursuit of this higher objective: authentic happiness as the meaningful culmination of a well-lived life.