Ok so in basic terms a cache is like a photograph of a page that is saved and backed up on the web. Lets say a page hasn't been visited in a long long time then it might not have a cache. Going to a website/page repeatedly can cache it or take a photo of it to store online. Not normal looking caches is how some people judge a pet or acct to be illegit. Hope that helps i am not good at explaining things
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For example lets say there is an acct that has not been used in years but has a uc faerie draik. Immagine someone gains access to the draik and transfers it away to a different account. Now the pet might not have a cache as it wasn't viewed recently. If the poster were to try to trade it some certain pcers will jump all over the pet for not having a cache and the person could be reported for having a stolen pet. If it has a cache it might show the previous owners name on it. The account would look like it wasn't acessed in a while to suddenly trading away a pet randomly. So cache are very important
.(you need an account to see links)
good link if you want to try looking up cached pages to see what they look like