legacy code

Legacy code refers to outdated or older computer software or programming that is still in use, often because it continues to perform essential functions. While it may work reliably, it can be difficult to update or modify due to outdated technology, lack of documentation, or complex design. Maintaining legacy code is important for business continuity, but it can also pose challenges when integrating with newer systems or improving performance. Essentially, it’s the existing codebase that a company continues to rely on even as technology advances.