Authentication
Authentication is the process of verifying the identity of a user, device, or system before granting access to resources. It ensures that only authorized entities can interact with protected data or services, typically by validating credentials such as passwords, tokens, or biometric data. This concept is fundamental to security in computing, forming the basis for access control and trust in digital interactions.
Developers should learn authentication to secure applications, APIs, and systems against unauthorized access, which is critical for protecting sensitive data and complying with regulations like GDPR or HIPAA. It is essential in use cases such as user logins for web apps, API key validation for microservices, and multi-factor authentication for high-security environments like banking or healthcare systems.