On the I cloud on the Iphone what does total storage and available storage mean?

Basically it says total storage 5gb and availible storage 5 gb. Does that mean there's already 5 gb of files on the Icloud?

5GB total storage means you may store up to 5GB of data in the Cloud. Available storage 5GB means you have not stored anything and there's 5GB of space which remains available to you.

If it said "Available storage 4GB" it would mean that you have used 1GB of your storage space and you have 4GB remaining.