often describe personal characteristics e.g. 'thoughtful' or 'cunning'
sometimes they define status e.g. 'bright-eyed' Athene (immortals shine) or 'white-armed' Nausicaa (noble women do not work in the sun)
the essential nature of objects or places is also expressed in epithets e.g. 'black' ship, 'tuneful' lyre, 'mellow' wine, 'woody' Zakynthos, 'sea-girt' Ithaca
they are used frequently by oral poets as they fit into the metre and can be slotted in during composition like prefabricated units