Google cache means it shows when your page is crawl last time by google crawler.

i think you are correct on this point. just can say i have the same opinion like you.

With this question I raise one more debate by asking this question that what is the difference between cache and Index

With this question I raise one more debate
 

When crawlers are crawling the page we call it cache and how is the Indexing process works

it depends upon bot when they are crawling you page.

Thank you
 

Thank you .. for the fabulous info ....

What Cache means???

it is the algorithm that , use for get the information , about the whole page .and then other info can be taken from that page which Google get the picture also about that page

Disk caching works under the same principle as memory caching, but instead of using high-speed SRAM, a disk cache uses conventional main memory. The most recently accessed data from the disk (as well as adjacent sectors) is stored in a memory buffer. When a program needs to access data from the disk, it first checks the disk cache to see if the data is there. Disk caching can dramatically improve the performance of applications, because accessing a byte of data in RAM can be thousands of times faster than accessing a byte on a hard disk.

i really didn't know that thing..... well Is cache different from crawling .... ????

Google Search Engine shows which web page what they have catch or crawled.

Google cache date is all about Google's crawler visited last time to your page.

google cache is an updated feature where you can see if the spiders crawled your new pages or the updates that you've made to your website. since it's always updated and if your cache is updated you're sure that the backlinks that you have are seo friendly website.

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I found this threat very informative and useful. I heard about this but i don't have any idea, how it works. Thanks for everything.