Varnish is a content caching platform, which is sometimes called a caching HTTP reverse proxy. It’s a website accelerator tool that can improve the loading speed of a website by up to 1000 percent, depending on its content. Anytime a visitor accesses any page on a site that uses Varnish, the platform caches the page and delivers it instead of the web server when the visitor opens it again. Thus, the browser request from the visitor is not processed by the server and the web page will open substantially faster, since the Varnish platform can serve content many times faster than any server software. The end result is a significantly faster loading website, which means an enormously improved browsing experience. In case any of the cached pages is updated on the actual Internet site, the content that Varnish stores in its system memory is ‘refreshed’ too, so the visitors will never see outdated content.