Usability of web authentication systems

Usability of web authentication systems is how easy it is for people to access a website or web app. This is important because if it's difficult to use the website or web app, people won't bother using it. A web authentication system usually requires someone to enter their username and password, or complete other steps, to be able to access the website or app. The most usable web authentication systems make it easy to sign up and log into the website or app.