What are the main ingredients in mayonnaise?

Explanation

Mayonnaise is a cold creamy sauce. It is a stable emulsion of oil, egg yolk and either vinegar or lemon juice. Often, mustard or other flavours are added. It has a thick, creamy consistency and is normally too solid to be poured. Mayonnaise as we know it originates in France. In many countries, it is popular to eat with chips.