When you create a TP-Link ID, an email address will be required. Your TP-Link ID uses email addresses to sign you in to your account with TP-Link devices or TP-Link Apps like VIGI App, Kasa App, Tapo App, Tether App, Deco App etc. and provide the related services. Most of the TP-Link devices can still function properly without using the App or TP-Link ID, but the VIGI App, Deco series, Kasa series and Tapo series devices must be set up and managed through the Apps. With TP-Link ID, you can: Verifying your account. Resetting your password. Remote management of your TP-Link devices.