As the name might suggest, seafood includes all products that humans obtain from the sea. However, this is not entirely accurate. Seafood is commonly considered to encompass all kinds of food products obtained from the sea, excluding fish, as well as the meat of marine mammals — whales, seals, walruses, and others.
Despite such a restriction, all types of seafood include a vast variety of living organisms that humans can consume as food. Classifying them, unlike land-based products, is more difficult since algae, plants, and animals are all mixed together in one group.
Nonetheless, we will attempt to bring order to this diversity. This is even more necessary given the extraordinary popularity of various types of seafood today, and considering the increasing interest of the food industry in food from "blue fields," they are appearing more frequently on our tables. The most popular types of seafood that can be easily found on supermarket shelves are crustaceans — lobsters, langoustines, shrimp, mollusks — octopuses, squids, mussels, oysters, seaweed, and many others.