DirectX is a collection of application programming interfaces (APIs) designed to handle tasks related to multimedia, especially game video and programming, on Microsoft platforms. This software is an ideal platform for displaying applications rich in elements such as 3D animation, full-color graphics, video, and rich audio.
Since no two gaming computers have the same exact components, game developers use DirectX libraries in writing games that will work on all kinds of computers. In the old days, you have to separately download DirectX. Often, you will notice a prompt asking you to check for DirectX updates when you installed a game. However, since Windows 8, DirectX has been included as part of Windows, which means you can have the software updated from the Windows Update.
DirectX also comes with performance and security updates and several new features across all technologies, which you can access using the DirectX APIs. DirectX 12 is the latest version of DirectX, and it is available only in Windows 10.