Bone marrow is a soft, spongy tissue found inside our bones. It plays a crucial role in producing blood cells, including red blood cells, which carry oxygen, and white blood cells, which help fight infections. There are two types of bone marrow: red marrow, which is responsible for blood cell production, and yellow marrow, which stores fat and can convert to red marrow if needed. In addition to blood cell production, bone marrow is also important for the immune system. It contains stem cells, which are special cells that can develop into different types of blood cells. This makes bone marrow essential for maintaining our overall health and well-being.