Quesadillas are a popular Mexican dish made by filling a tortilla, usually made of corn or flour, with cheese and other ingredients such as meats, beans, or vegetables. The tortilla is then folded in half and cooked until the cheese melts, creating a delicious and satisfying meal that can be enjoyed at any time of day. Often served with sides like salsa, guacamole, or sour cream, quesadillas are versatile and can be customized to suit various tastes. They are commonly found in taquerias and are a favorite among both locals and tourists, making them a staple of Mexican street food culture.