Legacy systems are outdated computer systems or applications that are still in use, often because they perform essential functions for an organization. These systems may be based on older technology, making them difficult to maintain and integrate with newer systems. Despite their age, they can be critical for daily operations, especially in industries like finance and healthcare. Organizations face challenges when managing legacy systems, including high maintenance costs and security risks. Upgrading or replacing these systems can be complex and costly, leading many businesses to continue using them. However, the reliance on legacy systems can hinder innovation and efficiency in the long run.