When your computer needs to run programs that are bigger than your available physical memory, most modern operating systems use a technique called swapping, in which chunks of memory are temporarily stored on the hard disk while other data is moved into physical memory space.

Every web site needs a domain name. Every domain name needs DNS. Yet, it’s often overlooked and misunderstood. If you own a domain you need to understand DNS. And here’s the low-down as well as some helpful Linux tools.