Tapas are small, bite-sized dishes that are typically served as appetizers or snacks in Spain. They can vary greatly in terms of ingredients and flavors, but some popular tapas options in Madrid include patatas bravas (fried potatoes with a spicy tomato sauce), tortilla española (a thick omelette made with potatoes and eggs), and jamón ibérico (cured ham). Tapas are a great way to sample a variety of flavors and dishes in one sitting, making it a fun and social dining experience.