Connective tissue is a type of human tissue that is composed of cells, fibers and matrix, and has the function of linking and fixing various tissues and organs. Connective tissue is divided into loose connective tissue, dense connective tissue and adipose tissue. Loose connective tissue is widely distributed in the body and mainly exists between tissues and organs, such as subcutaneous tissue. Dense connective tissues include tendons and ligaments. Head connective tissue group excision is an internet term that means haircut, but hair is not a connective tissue.