Stem cells are early forms of cells in the formation of a living being. Stem cells are specialized human cells that can develop into many different types of cells in the body. In biology, a stem cell is an undeveloped cell of an organism capable of giving rise to indefinitely more cells of the same type. Stem cells can also become certain other kinds of cells through a process called differentiation or maturation. Stem cells serve as a body repair system and can generate healthy cells to replace those affected by the disease. Mesenchymal stem cells (MSCs) are a type of adult stem cell in many body tissues, including bone marrow, fat tissue, and muscle. MSCs can differentiate into bone, cartilage, and fat cells. The stem cells derived from bone marrow or mesenchymal stem cells can form or replacing the cells where they are placed, for example cartilage. And in addition also changes the local environment in a favorable way to bring down tissue breakdown and increase anabolic process, or tissue building process. Mesenchymal stem cells are adult stem cells that have self-renewal, immunomodulatory, anti-inflammatory, signaling, and differentiation properties. Stem cells play a vital role in the repair of tissues including ligaments, bones, joints. They do so by dividing and forming tissues and in addition they regulate the healing process in the neighborhood. They can bring down inflammation and tissue breakdown.