Internationalization (i18n) is the process of designing and developing software applications so they can be easily adapted to different languages, regions, and cultures without requiring engineering changes to the source code. In cybersecurity, internationalization ensures that security messages, authentication processes, and data handling comply with local regulations and user expectations worldwide. This approach supports localization (l10n), where the actual adaptation for specific markets occurs. Proper i18n helps prevent vulnerabilities that may arise from improper character encoding, date formats, or region-specific security requirements, making software more secure and accessible globally.