Varnish is a content caching platform, which is occasionally called a caching HTTP reverse proxy. It’s a web accelerator tool that can improve the load speed of a site by up to one thousand percent, based on its content. Whenever a visitor opens any page on a site that uses Varnish, the platform caches the page and delivers it instead of the web server when the visitor accesses it again. Thus, the web browser request from the visitor is not processed by the web server and the page will load much faster, since the Varnish caching platform can deliver data many times faster than any server software. The result will be a significantly faster loading website, which means an improved browsing experience. In case any of the cached pages is updated on the live site, the information that Varnish caches in its memory is ‘refreshed’ too, so the users won’t see old data.