IPv6 uses 128-bit IP addresses, providing a significantly larger address space compared to IPv4. This expanded address space allows for trillions of unique IP addresses, enabling the growing number of devices and services connected to the internet. IPv6 also introduces improvements in security, network auto-configuration, and support for new technologies.

In summary, IPv6 is the next-generation protocol that succeeds IPv4 and offers a larger address space and improved features for the internet.