You need to get the host of the server to provide you with their ip address. To do this,(on windows XP), go to start and choose "run", then type in "cmd" ,(this will open up the command prompt), in the cmd type in "ipconfig" this will give you the ip. Your host will also need to have there ports forwarded for minecraft.
It is a public server that you can join.
The ip to join a server.
it is a private server
Unless your server has a whitelist or a blacklist, anyone with the IP address of your server can join it
A minecraft server IP is what you type in to join a specific server. A good one is mc.aviatorshow.com
i would
The server address is the "IP" and you type it in the connecting to muiti servers box, and you join a minecraft server.
That is private server that he uses with his friends. There is no chance you could join, except if you are his friend. You will never get the IP. Deal with it.
You update your minecraft or get the older version. If your minecraft version doesn't match the server's version, then you can't join it no matter what you do.
you give them the IP address of your server and then they tipe it in on the online option on the mane menu of minecraft and then they should be able to join
I do, is it english?
Check the Minecraft Wiki. It has information there.