辣 (Spicy) refers to a flavor sensation that produces a burning or tingling feeling in the mouth. This sensation is primarily caused by compounds like capsaicin, found in chili peppers. Spicy foods are popular in many cuisines around the world, including Mexican, Indian, and Thai dishes, where they enhance the overall taste and experience of the meal. The level of spiciness is often measured using the Scoville scale, which quantifies the heat of chili peppers based on their capsaicin content. Foods that are considered spicy can vary widely in intensity, appealing to those who enjoy bold flavors and the unique experience that comes with consuming them.