The crab is a crustacean crab of ten from Brachyura's infraorda, known to have a very short "tail" (Greek: brachy = short, ura = tail), or whose abdomen is completely hidden beneath the chest (thorax) . the body of the crab is protected by a very hard shell, composed of chitin, and armed with a pair of claws. Ketam is another name for crab.
Crabs are present in all the oceans of the world. There are also freshwater and terrestrial crabs, especially in tropical regions. crabs are crabs that live in the waters of the sea and rarely go to the beach, while yuyu is the crab of the inhabitants of freshwater