Russian dressing is a type of salad dressing that typically combines mayonnaise, ketchup, and various seasonings, such as horseradish, onion, and spices. It has a creamy texture and a slightly tangy flavor, making it a popular choice for salads and sandwiches. Thousand Island dressing is similar to Russian dressing but usually includes additional ingredients like sweet pickle relish, hard-boiled eggs, and vinegar. This dressing is known for its sweet and tangy taste, often used on salads, burgers, and as a dip. Both dressings are versatile and can enhance a variety of dishes.