Ketchup (i/ˈkɛtʃəp/ or i/ˈkɛtʃʌp/), also occasionally catsup, is a table sauce. Traditionally, different recipes featured ketchup made of mushrooms, oysters, mussels, walnuts, or other foods,  but in modern times the term without modification usually means tomato ketchup, often called tomato sauce, or, occasionally red sauce. It is a sweet and tangy sauce, typically made fromtomatoes, vinegar, a sweetener, and assorted seasonings and spices. The sweetener is most commonly sugar or more specifically in the United States, high fructose corn syrup. Seasonings vary by recipe, but commonly include onions,allspice, cloves, cinnamon, garlic, and sometimes celery.
Tomato ketchup is often used as a condiment with various dishes that are usually served hot, including chips/fries, hamburgers, sandwiches, hot dogs, eggs, and grilled or fried meat. Ketchup is sometimes used as a basis or ingredient for other sauces and dressings. Ketchup is also used as a flavour for things such ascrisps/potato chips, this variety of crisps/chips is one of the most-popular flavors of them in Canada, and is quite popular in the UK, as well. They have also recently been offered in the US. Mushroom ketchup also is available in the UK; though it is not a commonly used condiment. Mushroom ketchup is rare in the US, and other nations.