Which problem does IPv$6($Internet Protocol version $6)$ help to solve?

Companies waste hundreds of public IP addresses. With IPv$6,$ they can use just one IP address.

IPv$5$ is an outdated protocol version with insufficient security safeguards.

Internet Protocol versions prior to version $6$ haven't achieved widespread use.

There are less than $4\mathrm{.}3$ billion IPv$4$ addresses, which has already been exceeded with existing websites.