Windows app development using C++ involves building applications specifically for the Windows operating system using the C++ programming language. C++ is a powerful and versatile programming language that allows developers to create high-performance, efficient, and native Windows applications. When it comes to Windows app development in C++, there are several key components and technologies to consider:

1. Win32 API: The Windows API, often referred to as the Win32 API, is a set of functions and interfaces provided by Microsoft that allows developers to interact with the Windows operating system. It provides low-level access to various features of the operating system, such as user interface controls, file management, networking, and more.

2. Windows Presentation Foundation (WPF): WPF is a UI framework provided by Microsoft for building desktop applications on Windows. While WPF is typically associated with C# and XAML, it also has support for C++ through the C++/CLI (Common Language Infrastructure) language. With WPF, developers can create visually appealing and interactive user interfaces for Windows applications.

3. Universal Windows Platform (UWP): UWP is a platform and application model introduced by Microsoft for developing Windows apps that can run across different Windows devices. While UWP has native support for C# and XAML, it also provides support for C++ through the C++/CX language. With UWP, developers can build applications that can target various Windows devices, including desktops, laptops, tablets, smartphones, and Xbox.

4. Windows Forms: Windows Forms is a UI framework provided by Microsoft that allows developers to build Windows desktop applications using C++. It provides a simple and straightforward way to create user interfaces by dragging and dropping controls onto forms and handling events using C++ code.

5. Visual Studio IDE: Visual Studio is Microsoft's integrated development environment (IDE) that provides comprehensive tools and features for developing Windows applications in C++. It offers a rich set of code editors, debugging tools, designers, and project management features that enhance the development process.

6. DirectX: DirectX is a collection of APIs (Application Programming Interfaces) provided by Microsoft for developing multimedia and gaming applications on Windows. It includes libraries and tools for working with graphics, audio, input devices, and other multimedia components. C++ is commonly used with DirectX for building high-performance graphics-intensive applications.

7. Windows App Certification Kit (WACK): WACK is a tool provided by Microsoft to test and certify Windows applications for compatibility, performance, and adherence to Windows Store guidelines. It helps ensure that your application meets the requirements for distribution through the Microsoft Store.

8. WinAPI Libraries and Frameworks: In addition to the Win32 API, there are various libraries and frameworks available that simplify Windows app development in C++. These include ATL (Active Template Library) for COM (Component Object Model) development, MFC (Microsoft Foundation Classes) for building UI applications, and Boost for providing additional functionality and abstractions.

9. Community and Documentation: The C++ developer community is vast and active, with many resources available for learning, support, and collaboration. Microsoft provides extensive documentation, tutorials, samples, and forums to assist developers in their Windows app development journey using C++.

Windows app development in C++ allows developers to harness the full power of the Windows operating system and create high-performance applications. Whether using the Win32 API, WPF, UWP, or Windows Forms, C++ provides a robust language for building native Windows applications with control over memory management, performance optimizations, and direct access to system resources.