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Ligaments are the type of connective tissue responsible for connecting bone to bone at joints. They provide stability and support to the skeletal structure while allowing for appropriate movement. Ligaments are composed of dense, fibrous connective tissue that contains a high concentration of collagen fibers, giving them the strength and flexibility needed to withstand various forces exerted on the joints. This structural composition also aids in preventing excessive movement that could lead to injuries.

In contrast, tendons connect muscles to bones, facilitating movement by transferring the force generated by muscle contraction to the skeletal system. Cartilage serves as a cushion and reduces friction between the bones at joints, but it does not connect bones together. Fascia is another type of connective tissue that encloses muscles and organs but is not specifically involved in connecting bones to each other. Therefore, the role of ligaments in maintaining joint integrity and function is essential, making them the correct answer to the question.