Jalapeño peppers are a popular type of chili pepper, known for their moderate level of heat and distinct flavor. They are commonly used in various cuisines, from Tex-Mex to Thai, and can be enjoyed fresh, pickled, or smoked (as chipotles). Jalapeños are relatively mild compared to other chili peppers, typically ranging from 2,500 to 8,000 Scoville heat units.