If you want to play on a baseball team, get a mitt, a protective leather glove. And if you want to take a cake out of the oven, get an oven mitt, a giant heat-proof mitten. A mitt protects a hand.
Since mitts were introduced to baseball in the 19th century, every player on a team uses one. Before that, players used their bare hands — or they improvised gloves with the fingers cut off, to slightly pad the catching hand. Today's mitts are wide and sturdy. An oven mitt isn’t helpful in baseball, but it also protects hands. In fact, mitt can also mean "hand" informally: "Get your mitts off my chocolate cupcake!"