Varnish is a content caching platform, which is occasionally called a caching HTTP reverse proxy. It is a web app accelerator tool that can boost the loading 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 if the visitor opens it again. Thus, the web browser request from the visitor is not handled by the web server and the page will load considerably faster, since the Varnish platform can deliver content many times faster than any web server software. The result will be a significantly faster loading website, which leads to a much-improved visitor experience. In case any of the cached pages is updated on the live Internet site, the content that Varnish saves in its system memory is updated as well, so the website visitors won’t see out-of-date content.