Yeah, when you RENT servers you pay X amount each month/quarterly/semi-annually/annually and in return get access to:
A server!
Online file storage! - size seems to usually be 50GB, but that is often increased when you go above 6gb of RAM
A console GUI?
Customer support?
VOIP server*?
Anything with ! means you definitely get it.
Anything with ? means it varies between server hosts
Anything with * means you usually pay extra for it.
For CreeperHost you get:
Server, File storage, GUI - Multicraft, Free customer support - support tickets, sometimes live chat, and -unless they changed it- you get a free 10 slot mumble server.
However, I would NOT recommend CreeperHost, as I used them a while ago, and the server was terrible. It worked, but it crashed a lot, and for what you pay you don't get much.
I would recommend
WebSound as they are extremely cheap, compared to most server hosts, but you don't get terrible servers in return. I have been running a 4gb server with them for almost 4 months now, and I have never had issues with it. Even when people were in multiple dimensions/creating new ages. It only ever struggles when people explore new chunks pretty fast (e.g. air sigil flying until they find <biome>).
Also, I can tell you now they are the best I have used, and I have used:
Websound
MossyCobble
FragNet
CreeperHost
<server host no longer exists>
and McProHosting.
And out of all of them, I would definitely recommend WebSound.
I know you weren't asking for a server host suggestion, but it's always best to suggest before you make a bad purchase. Especially if you were to buy a 12gb server with a host, only to find it crashes every 20 minutes. (which is basically what happened with CreeperHost)