Mayo, short for mayonnaise, is a thick, creamy condiment made primarily from egg yolks, oil, and vinegar or lemon juice. It is commonly used in sandwiches, salads, and dressings, providing a rich flavor and smooth texture. The origins of mayo can be traced back to the 18th century, with various theories about its invention. It is popular in many cuisines around the world and can be found in different variations, including aioli, which incorporates garlic, and vegan mayo, made without eggs.