Login UI plays a highly critical role in a web application under UX Criteria. It determines the user retention rate. Authentication is essential to any web application. Also, any web application should follow these simple principles while providing login options like Simplify registrations, allowing login via external accounts, and facilitating password resetting. You can customize and authenticate applications with External Login/Sign-up options using these libraries. There are plenty of choices available to authenticate using external accounts like Google, Facebook, GitHub, etc.