This document discusses various methods that organizations use to secure data and systems, including access control, encryption, passwords, access cards, active badges, firewalls, and biometrics. Access control methods restrict physical and digital access to systems and data. Encryption transforms readable text into encrypted files using keys. Password systems require logging in with a username and password. Access cards and active badges track employee locations. Firewalls protect networks from external access. Biometrics uses physical and behavioral traits to automatically identify individuals, increasing security over passwords.