When applied to the context of your website, this translates to the ability to deliver a webpage with a super-fast response time without having to do all the time-consuming processing, every time the page loads.

The first visitor to a particular page on your site is “asking the question” and your server provides the answer. The next time a visitor goes to the same page, ie. “asks the same question”, your server can provide the answer, i.e the web page, much faster.