Ceviche, cebiche, sebiche, or seviche is a dish consisting of fish or shellfish marinated in citrus and seasonings, recognized by UNESCO as an expression of Peruvian traditional cuisine and Intangible Cultural Heritage of Humanity, although different versions of ceviche are part of the culinary culture of various Spanish-American countries along the Pacific Ocean where each one is native: Chile, Colombia, Costa Rica, Ecuador, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, Panama and Peru. In Peru it is also considered a flagship dish and cultural heritage.

Marinating is the process of soaking foods in a seasoned, often acidic, liquid before cooking. The origin of the word alludes to the use of brine in the pickling process, which led to the technique of adding flavor by immersion in liquid. The liquid in question, the marinade, can be either acidic or enzymatic, or have a neutral pH. In addition to these ingredients, a marinade often contains oils, herbs, and spices to further flavor the food items.