In cybersecurity, 'legacy' refers to outdated systems, software, or hardware that are still in use, often because they are critical to business operations or difficult to replace. These legacy components may lack modern security features and are more vulnerable to cyber threats, as they might not receive regular updates or patches. Maintaining legacy systems can pose significant security risks, including exposure to known vulnerabilities, compatibility issues with newer technologies, and increased operational costs. Organizations must assess the risks associated with legacy assets and plan for their secure integration, upgrade, or eventual replacement to ensure ongoing cybersecurity resilience.