Understanding page faults and memory swap-in/outs: when should you worry?
Imagine this: your library is trying to step up its game and compete in the Internet age. Rather than you browsing the shelfs, trying to remember how the Dewey Decimal works, you'll enter your book selections from your phone. A librarian will then bring your books to the front desk. You place your book order on a busy weekend morning. Rather than getting all of your books, the librarian just brings one back.