OAuth means open authorization protocol. 

This protocol allows you to access the client applications on HTTP for third-party providers GitHub, Facebook, etc. 

It helps you to share resources stored on one site with another site without the need for their credentials.

https://www.hp.com/us-en/shop/tech-takes/what-is-oauth#:~:text=OAuth%2C%20which%20stands%20for%20%E2%80%9COpen,to%20give%20away%20your%20password.