Connective tissue is formed by a combination of protein fibers, proteoglycans and hayaluronan. It developed from mesoderm and perform wide range of functions. The relative amount of these components determine the function of connective tissue.
More collagen fiber would be present in connective tissue in bone and tendon.
Connective tissue of organs contain less collagen and more proteoglycans.
Connective tissue is located in blood, body fat, ligaments and tendons, dermis of the skin, and in the cartilage of some joints.