What does D.O.R.A stands for?
The question originally stated "What is DNS short for?", to which this answer was provided:
DNS stands for Domain Name System. DNS is the service that translates domain names (e.g. google.com) to IP addresses (e.g. 18.104.22.168). Any DNS server can be used, not necessarily the one provided by your ISP (Internet Service Provider).
For more information, see: https://en.wikipedia.org/wiki/Domain_Name_System