Compact bone is a dense and strong type of bone tissue that forms the outer layer of bones. It provides structural support and protection for the inner, more porous bone tissue known as spongy bone. Compact bone is made up of tightly packed units called osteons, which contain a central canal for blood vessels and nerves. This type of bone is crucial for maintaining the overall strength and integrity of the skeleton. It helps withstand compressive forces and provides a surface for muscle attachment. Compact bone is essential for activities such as walking, running, and lifting, contributing to overall mobility and stability.