Legacy software refers to older computer programs or systems that are still in use, despite being outdated or no longer supported by their developers. These programs may have been built using older programming languages or technologies, making them difficult to maintain or integrate with newer systems. Organizations often continue using legacy software because it still meets their needs or because replacing it would be costly and time-consuming. While legacy software can be reliable, it poses challenges such as security vulnerabilities and compatibility issues with modern hardware and software. Companies may need to invest in updates or replacements to ensure they remain competitive and secure in a rapidly evolving technological landscape.