The term "encryption" is used to describe a method of locking down a piece of data, like putting a padlock on a door. Once data is encrypted, you need a key to unlock the data, just like you would have to unlock the door. Let's continue with our chicken soup example.

 

Imagine that the Web site where you want to purchase the cookbook is a verified Web site with a valid security certificate. When you proceed to the Web site "checkout" to pay for your cookbook, the Web site sends encryption data to your computer. Internet Explorer has the ability to use this encryption data as a special method of protecting your name, mailing address, and credit card number.

 

When you make the purchase, your personal data is locked away in an encrypted file that is sent to the Web site. Once the file is received, the Web site uses its key to unlock the data and process your transaction.