Durandal is a JavaScript framework designed to facilitate building rich client-side applications. It is well-suited for those conducting more extensive, single-page application development. The framework is recognized for its ability to help developers create modular applications by promoting clean architecture, reusability, and maintainability of code. Durandal provides integrated solutions for tasks such as setting up routing, managing application state, and composing user interfaces. It emphasizes the importance of using standards and modern design principles to streamline the development process. Although it has been a popular choice in the past, the Durandal framework is no longer being actively developed; its creators have since endorsed and transitioned to working on Aurelia, which is a more modern, next-generation framework.