Marinara (English: "mariner's") sauce is an Italian sauce that originated in Naples, usually made with tomatoes, garlic, herbs, and onions. Its many variations can include the addition of capers, olives, spices, and a dash of wine.
This sauce is widely used in Italian-American cuisine, which has greatly diverged from its Old World origins.
Italians refer to marinara sauce only in association with other recipes. For instance, spaghetti alla marinara literally translates to "spaghetti mariner's style" (from the adjective marinara with the feminine suffix -a pertaining to salsa, Italian for "sauce", and also to maniera, Italian for "style"), but tomato sauce alone in Italy is called sugo/salsa al/di pomodoro or pummarola (the latter being Neapolitan language).