You might think the security of your PC, laptop, phone, or tablet ends with an antivirus, malware, and firewall combination . Although those tools are a good start, there's one area you should seriously consider: DNS . DNS, or Domain Name System, is responsible for translating human readable domain names such as zdnet.com to machine readable IP addresses such as 199.232.194.154. Without DNS, you'd have to memorize IP addresses instead of domain names. I don't know about you, but...