Visualization and mental rehearsal—the deliberate creation of vivid, multi-sensory mental images of performance without physical movement—represent one of sport psychology's most researched and applied mental skills, with roots extending into fields ranging from rehabilitation to public speaking. First systematically studied in the 1970s-1980s with pioneering work by researchers like Richard Suinn, Alan Paivio, and Peter Lang, mental imagery leverages the brain's functional equivalence between imagined and actual movement, activating overlapping neural pathways and creating measurable physiological responses. While often used interchangeably, visualization emphasizes visual components, whereas imagery encompasses all sensory modalities—kinesthetic, auditory, tactile, olfactory, emotional—enabling performers to mentally simulate experiences with remarkable fidelity. The key insight: imagery is not passive daydreaming; it's a trainable, deliberate practice requiring vividness, controllability, and functional realism to yield performance gains, confidence enhancement, anxiety reduction, and accelerated skill acquisition.