RFC 791 (Internet Protocol)

RFC 791 defines the Internet Protocol (IP), which is fundamental for sending data across networks. It acts like a postal system for the internet, assigning unique addresses to devices, splitting data into manageable packets, and routing these packets through various paths to reach their destination. IP ensures that data packets are accurately directed, handled efficiently, and can be reassembled correctly upon arrival. It provides the basic framework that allows different devices and networks to communicate seamlessly, making global internet connectivity possible.