How to understand what is Blu Ray technology and what is next day technology? To find out what is Blu Ray technology for DVD and how it works you have to know the history of previous formats for data and video. So, there were VHS disks and then revolution was – DVD and CD disks appeared on the electronic market and online shops. Today there is new up-to-date technology which has made some new revolution things in thoughts about Blu Ray technology and DVD disks at all. So, VHS cassettes this is