The technology framework notably used for building responsive user interfaces is React. Developed by Facebook, React allows developers to create dynamic single-page applications using components that manage their own state. Its component-based architecture promotes reusability and facilitates the development of complex user interfaces with ease. Moreover, React employs a virtual DOM, which optimizes rendering performance, ensuring a smooth user experience across devices. The framework is widely recognized for its efficiency and suitable for both small and large-scale applications, making it a go-to choice among web developers today.