A legacy application is an outdated software that is no longer actively maintained or developed. Its age, complexity, and reliance on outdated technologies often characterize it. These applications are typically critical to a business’s operations but can be difficult and expensive to maintain and update due to their outdated technology stack and codebase.Legacy applications can be found in various industries and domains, including finance, healthcare, and government. Many businesses rely on legacy applications because they are critical to their operations, and the cost of replacing them can be prohibitive.