These terms are basic to an understanding of life on the digital frontier.
Here’s a poll to test knowledge of the vocabulary on this site.
IP address – (Internet Protocol; also IP, network address; ) this is the numerical address given to each computer on the Internet. Think of it as similar to a phone number. Version four of this numbering system (IPv4) has a format of four 3 character numbers from 0 to 254 separated by a period e.g. aaa.bbb.ccc.ddd. We know those numbers as (for example) http://www.microsoft.com.
Domain Name System (DNS) translates the numerical IP address to and from word forms easier for humans to use. So, for example one of the IP addresses of http://www.microsoft.com is http://207.46.1297.32 . DNS is the Internet service that does that automatically each time a web address is entered in the URL box or a link is clicked on.