Mozzarella is a traditionally southern Italian cheese made from Italian buffalo's milk. It's also commonly made in the USA which is where this variety comes from. Fresh mozzarella is generally white but may vary seasonally to slightly yellow depending on the animal's diet. Due to its high moisture content, it is traditionally served the day after it is made but can be kept in brine for up to a week or longer when sold in vacuum-sealed packages. Low-moisture mozzarella can be kept refrigerated for up to a month. Mozzarella of several kinds is used for most types of pizza and several pasta dishes or served with sliced tomatoes and basil in Caprese salad.