The Microsoft Visual C++ 2015 19 Redistributable Package x64 is a package that contains the Visual C++ runtime libraries required to run applications developed with Visual C++ 2015 on a 64-bit Windows operating system. This package is a redistributable package, which means that it can be freely distributed with applications that require it.

The naming can be confusing. You might see:

Allows multiple programs to use the same set of standard libraries, saving disk space.

The package installs several standard libraries used for basic computer functions: