You could use one of the many websites that you pay for them to host them to host the server, complete with many Bukkit plugins, ServerCraft being one. But if you want to host a server, and start it out from scratch, you could go to the top link in "related links" and download the "Multiplayer Beta Server" at the bottom of the page. It may help to follow a guide as to setting up the server on YouTube.
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no you can host your own server.
You have to be the host of the server.
If you are the host of the Server, you open up Minecraft Server . Wait for it to load then it will say its ready. If you are going to someone else's server, and it has no bars, then there server is not active. (Which means they dont have Minecraft Server up).
You do not need to own Minecraft to host servers for it.
You can.