Varnish is a website accelerator platform, which caches content for the sake of faster response times. It’s sometimes referred to as an HTTP reverse proxy as well and it works between a web server and a browser. When a visitor accesses a certain web page, its content is requested by the Internet browser, and then the server processes this browser request and returns the needed data. If Varnish is activated for a given website, it will cache the pages at the first visit and in case the user accesses a cached page once more, the info will be delivered by the accelerator platform and not by the server. The increased loading speed is a result of the significantly faster response speed that the Varnish platform offers as compared to any server software. Of course, this doesn’t mean that the site visitors will keep seeing the exact same content again and again, as any modification on any of the web pages is reflected in the content that Varnish stores in its memory.