RFC 5737 is a document that defines specific IP address ranges reserved for documentation and examples. These addresses are not routable on the public internet, meaning they can be used freely in manuals, tutorials, and other educational materials without the risk of conflicting with real-world addresses. The reserved ranges include 192.0.2.0/24, 198.51.100.0/24, and 203.0.113.0/24. By using these designated addresses, authors can provide clear and safe examples without causing confusion or potential network issues. This helps ensure that readers can understand networking concepts without worrying about accidentally using an address that might belong to someone else.