Compact bone is a dense and strong type of bone tissue that forms the outer layer of bones. It provides structural support and protection, making it essential for maintaining the shape and strength of the skeleton. Compact bone is composed of tightly packed units called osteons, which contain a central canal for blood vessels and nerves. This type of bone is crucial for weight-bearing activities and helps resist bending and fracturing. Unlike spongy bone, which is lighter and found inside bones, compact bone is solid and provides the necessary rigidity for movement and stability in the body.