A tortoise is a type of reptile characterized by a bony or cartilaginous shell that protects it from predators. Unlike turtles, which are primarily aquatic, tortoises are adapted to life on land and have sturdy, column-like legs. They belong to the order Testudines and are known for their slow movement and long lifespan, with some species living for over a century. Tortoises are mainly herbivorous, consuming a diet of grasses, leaves, and fruits. Their slow metabolism allows them to thrive in diverse environments, from deserts to forests, and they often dig burrows for shelter and to maintain moisture.