In the practice of yoga, kriyas are cleansing techniques designed to purify the body and mind. There are several types of kriyas in yoga, each targeting different aspects of physical and energetic purification. The six classical kriyas, known as Shatkarma, include Neti (nasal cleansing), Dhauti (digestive tract cleansing), Basti (colon cleansing), Nauli (abdominal massage), Kapalabhati (cleansing breath), and Trataka (gazing). These practices are essential for preparing the body for deeper yogic practices by removing toxins and enhancing energy flow.