Inodes? What the heck is that?!?

I have a dedicated Plesk server. This morning I was having some trouble with a few databases. I restarted my server and then it stopped responding completely. I emailed EV1 support, and they said:

"The reason your server is not responding the way it should respond is becuase you are out of space. Even though you have 18g free, you are out of inodes on the drive"

What the heck is an inode? And why does that mean I can't use the 18gb I have?!

 

 

 

 

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