DNS vs OpenDNS - Comparision
What is a DNS Server?
The Domain Name System (DNS) is a standard technology for managing the names of Web sites and other Internet domains. DNS technology allows you to type names into your Web browser like compnetworking.about.com and your computer to automatically find that address on the Internet. A key element of the DNS is a worldwide collection of DNS servers.
A DNS server is any computer registered to join the Domain Name System. A DNS server runs special-purpose networking software, features a public IP address,and contains a database of network names and addresses for other Internet hosts.
What is OpenDNS?
It is a free DNS service that translates the URLs of Web pages into IP addresses.
OpenDNS theoretically helps speed up Web browsing by using better DNS servers to resolves URLs faster than your Internet Service Provider (ISP). The increase is probably too small for you to notice on a regular basis, however. More importantly, the service gives you better control over the Web sites you and your family visits, and contains built-in controls to protect against hackers hijacking your browser.
What is dynamic DNS?
Many people get a dynamic Internet Protocol (IP) address assigned to them by their ISP or network operator. It is difficult for public Internet resources to know how to find a webserver or mailserver or other Internet-addressable resource located at a dynamic IP address. DDNS provides a workaround, giving an individual a method of registering their current IP address with a third-party service on the web so they are publicly accessible and addressable, even as their IP address changes over time.