The Fear card, Emotions family, yin polarity, evokes a movement that freezes before the unknown. It isn't there to be ignored, but to point to an area that calls for caution or preparation. This card invites you to identify precisely what's worrying you, rather than leaving it vague.
In Oradia's mirror-card system, Fear answers to Courage: the two don't oppose each other, they answer each other, like two sides of the same movement.
This page gives the card's general meaning. In a real draw, the Fear card is always read in relation to the other cards drawn and the intention set at the start — it's that combined reading, unique to each draw, that the online oracle develops.