Authentication systems are processes that verify the identity of a user or device before granting access to resources. They typically require users to provide credentials, such as a password or a biometric scan, to confirm their identity. This helps protect sensitive information and ensures that only authorized individuals can access certain systems or data. There are various types of authentication methods, including passwords, two-factor authentication, and biometric authentication. Each method has its strengths and weaknesses, and organizations often choose a combination of these methods to enhance security. Effective authentication systems are crucial for safeguarding personal and organizational data from unauthorized access.