The primary ingredient in a fish taco is fish, usually white fish like cod, tilapia, or halibut. Fish tacos are typically characterized by the way the fish is prepared, often being grilled, fried, or baked to enhance its flavor and texture. The fish is usually served in a soft or crunchy tortilla and topped with various accompaniments such as cabbage, salsa, avocado, and a drizzle of lime or crema. Fish tacos are popular for their fresh, vibrant flavors and versatility, as they can be customized with different spices and toppings based on regional preferences.