In many cases, these codes are sent by SMS text messages, and must be used within a few minutes.
This combines something you know – your user name and password – with something you have, which is generally a code that is generated on demand. In order to ensure security, most sensitive services now offer two-factor authentication (sometimes called two-step authentication). If someone gets access to some of your accounts – especially your email account – they can get access to others, and potentially usurp your identity.
Protecting your online accounts has become more important, as so much of our lives takes place on websites, via email, and through messaging. How To How to Use a Security Key to Protect Sensitive Online Accounts
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