What is authentication and why is it important in web applications? How can you implement authentication in Ruby on Rails?

Authentication is the process of verifying the identity of a user or entity requesting access to a system or application. It ensures that only authorized individuals can access protected resources or perform certain actions within a web application. Authentication is crucial in web applications for several reasons: 1. User identification: Authentication allows the application to identify individual users and associate their actions and data with their unique identities. This enables personalized experiences, tailored content, and user-specific functionality. 2. Access control: Authentication plays a vital role in enforcing access control policies. It ensures that only authenticated users with the necessary privileges can access certain parts of the application or perform specific actions. This helps protect sensitive data and prevents unauthorized users from tampering with or misusing the application's resources. 3. Security and confidentiality: Authentication enhances the security of a web application by verifying the identity of users. It ensures that users are who they claim to be, protecting against unauthorized access and potential security breaches. Authentication is particularly crucial for applications handling....