Static ip vs Dynamic ip

When an ip address is assigned to you that enables you to connect to global network which doesnt change with time then it is STATIC IP.By doing so there is insufficiency in the number of ip addressed as the number of net users increase exponentially with time.To avoid this unfavourable situation DYNAMIC IP was introduced which dynamically assigns address to the client when requested.The dynamic addressing concept is based on the fact that the number of users online at any time is very less than the total number of net users.The ISP maintains a large pool of addresses from which one address is assigned to a host when requested and get back into the pool when that host is disconnected.This can be done by DHCP(Dynamic Host Configuration Protocol)which provides dynamic ip to a host.Check your ip address before and after(i.e different sessions)your ip will definitely vary.To overcome this type of problems ipv6 was introduced and the world is slowly migrating to it.Japan has completely implemented IPv6.