They install run-time components of these libraries: C Runtime (CRT), Standard C++, MFC, C++ AMP, and OpenMP. These package can be used to run such applications on a computer even if it does not have Visual Studio 2015 installed. These components are required to run C++ applications that are developed using Visual Studio 2015 and link dynamically to libraries. The Visual C++ Redistributable Packages install run-time components of Visual C++ libraries. Redistributable Package install run-time components that are required to run C++ applications built using Visual Studio 2015. That’s because another program may have been installed in the meantime that also relies on those specific libraries.Microsoft Visual C++ 2015 provides a powerful and flexible development environment for creating Microsoft Windows based and Microsoft. Although a program will install missing libraries alongside itself, it won’t uninstall those libraries when you uninstall it. That means multiple applications make use of the same installation of standard libraries. The redistributable libraries are shared. So every one of the entries you see listed were at one time needed by an application you installed on your computer. Whenever you install a new application which requires a new distributable, it will check if that library is already installed. If they were cumulative the size of the redistributable would balloon over the years and become hard to maintain.

That’s because some older libraries will be dropped over time or will change and no longer be compatible with older versions. So newer ones don’t contain all the libraries of the versions that have come before. The redistributables are also not cumulative.

Microsoft visual c 2015