As previously mentioned, the Internet Protocol ensures that each data packet is preceded by the important structural features in the header and is assigned to the appropriate transport protocol (usually TCP). The header data area has been fundamentally revised for version 6, which is why it is necessary to specify between the IPv4 and IPv6 headers.

The first IP has been used broadly is IPV4 (Internet Protocol version 4) but it has encountered some problems with growth the number of user who use Internet. Internet Protocol version 6 is the next generation of Internet Protocol which has been used globally. Protocol Numbers - Internet Assigned Numbers Authority Jan 31, 2020 Windows 7 No internet Access but network connected Aug 11, 2018 Internet Protocol Version 6 (IPv6) | CSRC

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The sky may not be falling just yet, but it's not too early for IT managers to start thinking about migrating their networks to Internet Protocol Version 6 (IPv6), the new version of IP with Internet protocol versions — A review - IEEE Conference

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Internet Protocol (IP) version 6 - IBM