Authentication
Authentication is the process of verifying the identity of a user, device, or system attempting to access a resource. It ensures that only authorized entities can gain entry, typically by validating credentials such as passwords, tokens, or biometric data. This foundational security concept is critical for protecting sensitive data and systems from unauthorized access.
Developers should learn authentication to implement secure access control in applications, APIs, and networks, preventing breaches and data theft. It is essential for use cases like user logins, API key validation, and multi-factor authentication (MFA) in web, mobile, and enterprise systems. Understanding authentication helps comply with security standards and build trust with users.