Ancient Greek had four main words for "love", each with distinct meaning:
Agape is "true" unconditional love, as felt towards a beloved (or by God for mankind), encouraging one towards self-sacrifice.
Eros is sensual love, brimming with desire and longing.
Philia is virtuous, disinterested love or admiration, felt from afar or for one's friends and family.
Storge is affectionate love, as felt by parents for their children.