Plugins are something that go with bukkit, they change and add things to the game. Like there are plugins like Factions, Towny, IConomy, and World Edit, to name a Few. You can find more on the Bukkit Dev Site.
For plugins you need Bukkit, which is a wrapper for vanilla, and adds more to the game.
In my Opinion, any host that is charging to use plugins is a bad one, There are plenty out there that you can pick many different Modpacks, Bukkit, Vanilla, Snapshots, etc. for free. I am sure you can find one like this in the Hosting Section, right here on the forums.
For plugins you need Bukkit, which is a wrapper for vanilla, and adds more to the game.
In my Opinion, any host that is charging to use plugins is a bad one, There are plenty out there that you can pick many different Modpacks, Bukkit, Vanilla, Snapshots, etc. for free. I am sure you can find one like this in the Hosting Section, right here on the forums.