Microsoft Data Access Components (MDAC) is a set of libraries and tools that allow applications to access data from a variety of sources, including databases, spreadsheets, and web services. MDAC is a core component of many Microsoft applications, including Microsoft Office and Visual Studio.
Knowing the version of MDAC that is installed on your computer can be important for troubleshooting problems with applications that use MDAC. For example, if you are experiencing problems with an application that uses a specific version of MDAC, you may need to install that version of MDAC on your computer.