Question

What is the difference between IPv4 and IPv6?

Answer 1

IPv4 (Internet Protocol Version 4) uses a 32-bit address scheme allowing for a total of 2^32 addresses  to identify devices on a network through an addressing system while IPv6 (Internet Protocol Version 6)  are 128-bit IP address  it is the newest version of the Internet Protocol (IP) . It is designed to allow the Internet to grow steadily, both in terms of the number of hosts connected and the total amount of data traffic transmitted.

Answer 2

The Internet Protocol version 4 (IPv4) is a protocol for use on packet-switched Link Layer networks (e.g. Ethernet).  IPv4 provides an addressing capability of approximately 4.3 billion addresses.
The Internet Protocol version 6 (IPv6) is more advanced and has better features compared to IPv4.  It has the capability to provide an infinite number of addresses.  It is replacing IPv4 to accommodate the growing number of networks worldwide and help solve the IP address exhaustion problem.