content: Considering you probably already have a credit card or other payment info stored there, it just makes sense to add an extra layer of security that makes sure it's really you logging in.   ...  Until recently Amazon didn't have any option to support the feature, but now it does.  ...   Now, even if someone finds out your password then they only have part of the information needed for access.  ...   There are many ways to make sure all of your information online is as secure as possible, and using two-factor authentication along with unique passwords for every website are two of the most highly recommended ones