Edible shellfish are marine animals with a hard outer shell that are safe for human consumption. They include species such as clams, oysters, mussels, and scallops. These shellfish are rich in protein, vitamins, and minerals, making them a nutritious food choice. They can be prepared in various ways, including steaming, grilling, or baking. Shellfish are often categorized into two main groups: bivalves and cephalopods. Bivalves, like clams and oysters, have two shells, while cephalopods, such as squid and octopus, have a more complex structure. Proper handling and cooking are essential to ensure safety and prevent foodborne illnesses.