Definition
Identity refers to the unique characteristics and attributes that distinguish an individual, entity, or system from all others. It encompasses the data and information used to verify who or what is attempting to access resources or perform actions within a system. In practice, identity is established through authentication processes, such as passwords, multi-factor authentication, or biometric scans, which confirm a user's claimed identity. Understanding and managing identities is crucial for maintaining security, as it forms the foundation for authorization and access control decisions, preventing unauthorized access and potential breaches. For instance, a user logging into their bank account uses their username and password to establish their identity before being granted access to their financial information. This differs from an 'account,' which is a container for resources and permissions associated with an identity, not the identity itself. Concepts related to identity are fundamental to cybersecurity certifications like CompTIA Security+, CySA+, and CISSP.