Permissions
Permissions are a security mechanism that controls access to resources, such as files, data, or system functions, by defining what actions users, processes, or roles are allowed to perform. They are fundamental in operating systems, databases, and applications to enforce security policies, prevent unauthorized access, and ensure data integrity. Common models include discretionary access control (DAC), mandatory access control (MAC), and role-based access control (RBAC).
Developers should learn about permissions to build secure software that protects sensitive data and complies with regulations like GDPR or HIPAA. This is critical in multi-user systems, cloud applications, and enterprise software where access must be restricted based on user roles or policies. Understanding permissions helps prevent security breaches, such as data leaks or unauthorized modifications, by implementing proper authorization checks.