Description: An access control mechanism is a method used to enforce access control policies, ensuring that only authorized users can access specific resources within a system. This mechanism is fundamental to information security, as it helps prevent unauthorized access and protects sensitive data. Access control mechanisms can be role-based, attribute-based, or implemented through access control lists, and are applied across various platforms, including operating systems, applications, and cloud environments. In the context of cloud security, these mechanisms are essential for maintaining data integrity and confidentiality, especially in a zero-trust environment, where both internal and external networks are assumed to be vulnerable. Identity and access management (IAM) is an integral part of these mechanisms, allowing organizations to define who can access what resources and under what conditions. Additionally, in the context of modern network security, access control mechanisms are crucial for protecting infrastructure and data transmitted over various communication networks.