Animation that is computed as it is shown, so it can respond to input as it happens. It is the basis of video games, live visuals and interactive art.
Real-time animation is something where audiences begin to realize that this is a bit of a different beast.
Matt DesLauriers, Matt DesLauriers on a Generative World
GRASS was the original language Tom DeFanti wrote for the mini computer and the Vector General, which was a large interactive vector display for real-time animation in the '70s.
Larry Cuba, Larry Cuba on Choreographing Form