difference between Silver-Cash, Silver Sep 2020, Silver Dec 2020?

I was always watching Silver-Cash and thought was the only graph available. then I discovered the other two.
How does it work?
Is it a forecast? or what?
I noticed that graph is the same but price is increased respectively on the September one and the December one.
 
silver cash - it is spot price, like forex.

silver sept - it is futures sept 20 contract.
this contract is actively traded.

sliver dec - it is futures dec 20 contract. usually it is priced higher than nearer month (say sept 20) contract.
as of now, this contract is not actively traded
 
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