Aggressive bid depth. Big buyers placing limit orders below price. Acts as support — harder for price to drop through buy walls.
Aggressive ask depth. Big sellers placing limit orders above price. Acts as resistance — harder for price to break through sell walls.
When green dominates, buy pressure is building — bullish. When red dominates, sell pressure is building — bearish. Watch for sudden shifts.
Large walls that appear and disappear quickly are often spoof orders designed to manipulate. Watch if walls persist for multiple snapshots.