Qt
Qt is a cross-platform application development framework used for creating graphical user interfaces (GUIs) and applications that run on various software and hardware platforms. It provides a comprehensive set of libraries and tools for building desktop, embedded, and mobile applications with native performance and look-and-feel. The framework is written in C++ but supports bindings for other languages like Python and JavaScript.
Developers should learn Qt when building cross-platform desktop applications, embedded systems, or mobile apps that require a consistent UI across Windows, macOS, Linux, Android, and iOS. It is particularly valuable for projects needing high performance, native integration, and extensive widget libraries, such as in automotive, medical devices, or industrial automation software. Qt's signal-slot mechanism and modular architecture also make it suitable for large-scale, maintainable applications.