What is Page Cache?
The first option that you see on this page is Page Cache. It is responsible for creating static cache pages for each page that is loaded, so it is not being dynamically loaded upon each page load. By having this enabled, you will significantly decrease your load time. Refer to the image below to see how Page cache works:
As you can see normally when a user comes to your site, WordPress runs PHP scripts and MySQL queries to the database to find the requested page. Then PHP parses the data and generates a page.
This process takes server resources. Having the page caching turned on, allows you to skip all that server load and show a cached copy of the page when a user requests it.
Speed is one of the most important SEO factors. Faster websites rank higher in Google, this means more visitors for your business website and more conversions.
W3 Total Cache allows you to serve compressed and cached files to your visitors. This reduces the load on your server and your website becomes faster.