"Most seafoods should be simply threatened with heat and then celebrated with joy." –Jeff Smith, American cartoonist
Fish includes any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills.
Do you enjoy fish and chips? Fried clams? Tuna fish sandwiches? All of these qualify as seafood. Fresh seafood is sometimes hard to find if you live inland or in a very rural setting.
Several years ago we transitioned to only eating sustainable fish and seafood. There are still plenty of great options for fish lovers.