An Internet Protocol (IP) address serves two principal functions: it identifies the host or network interface and provides the location of the device in the network, facilitating data routing. IP addresses can be categorized into two types: IPv4, which utilizes a 32-bit address scheme allowing for approximately 4.3 billion unique addresses, and IPv6, which uses a 128-bit address scheme designed to accommodate the growing number of devices connected to the Internet, significantly expanding the address space.