Ip version 6 is new version of ip (Internet Protocol).
Old ipv4 has only 32 bits length and it can have 2^32 (4.3 billion) total ip addresses and ip4 has exhaustion.
IPv6 length is 128 bits and it can have 2^128 addresses (340 billion billion billion billion)
Whith ipv6 every device can have it’s own ip address.
Your isp can provide you ipv6, nowdays most os and programs support ipv6