Marinade refers to a liquid mixture that is used for soaking food, typically meat or fish, in order to add flavor and tenderize it. The marinade usually contains an acidic ingredient like vinegar or lemon juice, along with other seasonings such as oil, herbs, spices, and sometimes even vegetables. When the food is soaked in the marinade for a period of time before cooking, it allows the flavors to penetrate the meat and make it more tender and tasty.