Oysters are marine mollusks that belong to the family Ostreidae. They have a hard, irregular shell and are commonly found in saltwater environments. Oysters are known for their ability to filter water, which helps maintain the health of their ecosystems. They can be consumed raw, cooked, or used in various dishes. These creatures are also famous for producing pearls, which form when an irritant gets trapped inside their shells. Oysters are a popular delicacy in many cultures and are often served on the half shell with various sauces. They are also rich in nutrients, including zinc and vitamin B12.