Passwords are very important in applications as they create a barrier between unauthorized users and a resource in the application. These passwords alone can't prevent hackers from brute-forcing their way into your application, hence the need for Multi-Factor authentication.
Multi-Factor authentication creates a two-layered barrier between an unauthorized user and resources in your web applications. To get into your application, the user needs to provide their password and retrieve the One Time Password (OTP) sent to the user's email. This strengthens the security of your various applications to a large extent.
Follow this tutorial to learn how to integrate Multi-factor authentication in your applications.