Two factor authentication adds an additional layer of security to your account by requiring a numeric code from another device (most commonly mobile phones) when you log in.
These automatic tags can be used to filter comments or <x id="START_LINK" ctype="x-a" equiv-text="<a routerLink="/my-account/auto-tag-policies">"/>automatically block<x id="CLOSE_LINK" ctype="x-a" equiv-text="</a>"/> them.