Epicureanism, founded by Greek philosopher Epicurus, sought happiness through moderate pleasure and simple living. This school of thought emphasized friendship, rejected divine intervention, and believed in atomic theory. Epicureans aimed to achieve tranquility by avoiding pain and pursuing natural desires. Epicurean philosophy distinguished between necessary and vain desires, advocating for a life free from fear and anxiety. It viewed death as the end of sensation and argued that gods don't intervene in human affairs. Epicureanism influenced later philosophical and scientific thought, particularly in ethics and materialism.