I need a littel help with DNS(Domain Name System).

Ive read alot about DNS, and that it is a server/program that converts IP's to address's like(www.google.com) however i don't really understand them.

For instance, a LAN running on T1, I run a "ipconfig /all" to see the IP/Gateway/NIC addresses. In this information I also see two IPS assigned to DNS. What does this mean exactly? And also when I ping the IP's from the LAN, i get no response.