A Chief Information Security Officer (CISO) is a senior executive responsible for an organization's information security strategy and implementation. The CISO's primary role is to protect sensitive data and ensure compliance with regulations. They oversee security policies, manage risks, and respond to security incidents. The CISO collaborates with other executives, such as the Chief Executive Officer (CEO) and Chief Technology Officer (CTO), to align security initiatives with business goals. They also lead a team of security professionals and work with external partners to enhance the organization's overall security posture.