OpenID Connect is a simple and secure way for users to log into different websites and applications using a single account. Instead of creating new usernames and passwords for each site, users can authenticate through a trusted provider, like Google or Facebook. This not only saves time but also enhances security by reducing the number of passwords to remember. When a user wants to access a service, OpenID Connect allows that service to verify their identity through the chosen provider. This process involves exchanging tokens, which are like digital keys, ensuring that the user's information remains private and secure while still allowing access to the desired service.