I think everyone was thought about IPv4 and IPv6 but on internet are tones of articles about IPv6 and IPv4 and you should read more to understand this concept.
In this tutorial I will try to explain what is with IPv6 in few words.
How does IPv6 looks like?
First you should know that ipv6 is different from ipv4.
Does I have IPv6?
Well, the correctly question is: I’m connected to internet via IPv4 or IPv6?
Your IP is allocated by your internet provide, so they can give you an IPv4 or IPv6.
To check what kind of IP you are connected through you can go here: Check IP Address – IPv4 or IPv6
Because the IPv4 have 32bits of address and can provide maximum 4.3 billion addresses. So in the whole world this number of addresses has reached/will soon reached and we need more IP Addresses.
IPv6 have 128 bits and support approximately 2128 addresses.
You know a little but more about your connection and about your IP Addresses.
If you want more you should go to Wikipedia and read more documentation.