https://authy.com/what-is-2fa/

two-step verification(2-Step Verification)

Two-factor authentication is a security best practice. It may be easy to steal usernames and passwords on a user's computer as they are typed, but it is extremely difficult to also target that same user's second factor device. This greatly enhances security because simple attacks to gather usernames and passwords are now almost worthless.

https://rc.byu.edu/wiki/?id=Two-Factor+Authentication

1.Microsoft Authenticator app

https://support.microsoft.com/en-us/account-billing/set-up-an-authenticator-app-as-a-two-step-verification-method-2db39828-15e1-4614-b825-6e2b524e7c95

2.Google Authenticator

https://googleauthenticator.net/

3.zoho one

https://www.zoho.com.cn/accounts/oneauth.html

4.Tencent Authenticator

腾讯身份验证器（Tencent Authenticator）

https://apps.apple.com/cn/app/%E8%85%BE%E8%AE%AF%E8%BA%AB%E4%BB%BD%E9%AA%8C%E8%AF%81%E5%99%A8/id1573732533