1. What is it? The Microsoft Visual C++ 2019 Redistributable is a package of runtime components required to run applications built with Visual Studio 2019 (versions 14.20 to 14.28). It’s not a standalone program but a library of DLLs (e.g., vcruntime140.dll , msvcp140.dll , vcomp140.dll ) that provide standard C++ functions like memory management, input/output, and threading.