Conduct online research on web authentication and define what it is. Describe different authentication methods

It is a standard norms of web designed and governed by "W3c" (World Wide Web consortium). The idea of this is to authenticate user using public-key cryptography. Simply it is a way to handle security system in web based mode.

1. Cookie based authentication - This serves has the default method of authentication.

2. Token based: If you need security access only for web application and not mobile, this is preferable

3. Open ID

4. Third party access

5. SAML - If you want "single sign-on" go for this method of authentication

OTP is also one of the method of authentication.