Ashi-waza refers to a category of techniques in judo that focus on using the legs and feet to throw or off-balance an opponent. These techniques can involve sweeping, lifting, or tripping actions, allowing a judoka to leverage their lower body strength effectively. Common examples of ashi-waza include Ouchi Gari (major inner reap) and Kouchi Gari (minor inner reap). Mastering ashi-waza is essential for judokas, as it enhances their ability to control opponents and create opportunities for successful throws during a match.