IPv4 and IPv6 are versions of Internet Protocol used for identifying devices and routing traffic over networks. IPv4 uses 32-bit addresses (e.g., 192.168.0.1) and supports about 4.3 billion unique addresses, while IPv6 uses 128-bit addresses, offering a vastly larger address space and improved features like better security and efficiency. https://www.uninets.com/blog/compare-ipv4-and-ipv6-addressing