Connective tissue is the most abundant tissue type in the body and has a wide variety of functions, including connecting structures, holding organs in place, and storing lipids. Connective tissue is composed of cells within an intercellular matrix made of protein fibers and ground substance. The composition of the matrix gives each connective tissue its characteristics, with ground substance ranging from liquid to gel-like to solid depending on the tissue. The main protein fibers are collagen, which provides structure and tensile strength, and elastic fibers, which are highly elastic but less strong.