Kefir grains are small, gelatinous clusters that contain a symbiotic culture of bacteria and yeast. They are used to ferment milk or water, resulting in a tangy, probiotic-rich beverage known as kefir. The grains resemble tiny cauliflower florets and can vary in size and texture. When added to milk or sugar water, kefir grains ferment the liquid, producing beneficial probiotics and enzymes. This fermentation process typically takes 24 hours, after which the grains can be strained out and reused for future batches. Kefir is known for its health benefits, including improved digestion and immune support.