Which term refers to improving legacy applications using new technologies?

The term that describes the process of enhancing and updating legacy applications by incorporating new technologies is application modernization. This approach involves reengineering and transforming existing software to leverage modern technologies and practices, which can lead to improved performance, increased efficiency, and better integration with contemporary systems or cloud services.

Application modernization can include a range of activities such as migrating applications to cloud environments, refactoring code, adopting containerization, or even replatforming applications to utilize more advanced infrastructure. By modernizing these applications, organizations can improve their functionality and user experience, ultimately ensuring that they remain competitive and capable of meeting evolving business needs.

The other terms mentioned refer to different concepts. Microservices architecture refers specifically to an architectural style that structures an application as a collection of loosely coupled services, enhancing flexibility and scalability but not specifically focused on legacy applications. Software-as-a-Service describes a delivery model for software where applications are hosted in the cloud and accessed via a web browser, which does not inherently imply the improvement of legacy systems. Application infrastructure pertains to the underlying technical frameworks and services that support application deployments, but it does not directly involve the modernization of legacy applications themselves.