Varnish is a content caching platform, which is occasionally called an HTTP reverse proxy. It is a web app accelerator that can improve the loading speed of a site by up to 1000%, based on its content. Each time a visitor opens any page on a website that uses Varnish, the platform caches the page and delivers it instead of the web server when the visitor opens 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 is a considerably faster loading site, which leads to an improved website browsing experience. If any of the cached pages is updated on the actual Internet site, the content that Varnish saves in its system memory is ‘refreshed’ too, so the website visitors won’t see old data.