IP - address a computer on the Internet.
They have 4 types:
- if you have an external IP, then you will be able to connection (to
login) people from the internet (which is different from your ISP).
Internal - if you have an internal IP, then you will not be able to call people who do not have the same ISP as you.
Static - IP when that is not the same.
Dynamic - IP that changes each time you restart the modem \ reboot \ re entry into the Internet.
Thus we obtain four groups of IP.
External static - that is, you can go to all who want and IP will not change when. This IP is often not free (from $ 1 to $ 10 \ month).
dynamic - you will also be able to Connect everyone, but rebooting the
modem \ reboot \ re entry into the internet you have to give them a new
Internal static - you will be able to call only those people who have the same ISP as you. And the address is always the same.
internal dynamic - will go the same way as described above, but each
time you restart the modem \ reboot \ re entry into the internet you
have to give the new address of the players you people.