Dæmon is the Latin word for the Ancient Greek daimōn (δαίμων: “god”, “godlike”, “power”, “fate”), which refers to the daemons of ancient Greek religion and mythology and of later Hellenistic religion and philosophy.
"Daemon" is the Latin version of the Greek daimōn.
Daemons are benevolent or benign nature spirits, beings of the same nature as both mortals and deities, similar to ghosts, chthonic heroes, spirit guides, forces of nature or the deities themselves (see Plato's Symposium). Walter Burkert suggests that unlike the Christian use of demon in a strictly malignant sense, "[a] general belief in spirits is not expressed by the term daimon until the 5th century when a doctor asserts that neurotic women and girls can be driven to suicide by imaginary apparitions, ‘evil daimones’. How far this is an expression of widespread popular superstition is not easy to judge. On the basis of Hesiod's myth, however, what did gain currency was for great and powerful figures to be honoured after death as a daimon…"Daimon is not so much a type of quasi-divine being, according to Burkert, but rather a non-personified "peculiar mode" of their activity.
In Hesiod's Theogony, Phaëton becomes an incorporeal daimon or a divine spirit, but, for example, the ills released by Pandora are deadly deities, keres, not daimones. From Hesiod also, the people of the Golden Age were transformed into daimones by the will of Zeus, to serve mortals benevolently as their guardian spirits; "good beings who dispense riches…[nevertheless], they remain invisible, known only by their acts". The daimon of venerated heroes, were localized by the construction of shrines, so as not to wander restlessly, and were believed to confer protection and good fortune on those offering their respects.