What is passage and how does it differ from piaffe in dressage?

Passage is a highly collected, cadenced trot with a pronounced moment of suspension and exceptional elevation in each diagonal step, performed with slow, deliberate forward progression rather than in place as piaffe is performed. The movement is often described as a slow-motion trot in which each diagonal pair of legs rises to its maximum elevation and hangs in suspension before the horse's weight transfers to the opposite diagonal, creating a majestic, floating quality of movement that is one of the most spectacular expressions of advanced dressage. The differences between piaffe and passage are fundamental in their spatial relationship with the ground and their energy dynamics: piaffe is performed essentially in place with minimal forward movement and maximum collection; passage moves forward with each stride but at a very slow tempo that belies the horse's maintained impulsion, and the elevation and suspension of each step give the movement its characteristic floating appearance. Both movements share the same diagonal two-beat rhythm as the trot and both require maximum collection and hindquarter engagement, but they differ in how that collection is expressed — in piaffe, the energy is stored and expressed upward in place; in passage, the energy is stored and expressed upward while moving slowly forward. The transition between the two movements — from piaffe into passage and from passage into piaffe — is considered one of the most difficult and most valuable demonstrations of training quality in dressage, because it requires the horse to instantly redirect its energy either into more forward movement or into more stationary carrying power while maintaining the same quality of collection and rhythm. Passage first appears in the FEI Intermediate II test and is one of the defining movements of Grand Prix dressage.