The primary ingredient of a hot dog is usually processed meat, most commonly beef, pork, or a combination of meats. The meat is finely ground and mixed with various seasonings before being stuffed into a casing, typically made from animal intestines or synthetic materials. The mixture may also contain fillers, preservatives, and flavoring agents to enhance taste and texture. Hot dogs are a popular food item, often served in a sliced bun and topped with ingredients like mustard, ketchup, onions, and relish. This simple yet versatile food is especially popular at barbecues, sporting events, and street vendors.