Essentially it is either delivered as an MSI file or wrapped in an setup.exe file. You can perform an admin-install in a few different ways depending on how the installer is delivered. It is quite an important concept for system administrators, application packagers, setup developers, release managers, and even the average user to see what they are installing etc. Please read the stackoverflow post linked above for more details.
MSI advertisement (the " run from source" feature).Repair, modify and self-repair operations.Deployment via systems management software for example SCCM (avoids huge, cached MSI files in C:\Windows\Installer since files are extracted from internal cabs).Extracting and inspecting the installer files.In essence the admin install is important for: It is recommended to read more about admin-installs since it is a useful concept, and I have written a post on stackoverflow: What is the purpose of administrative installation initiated using msiexec /a?. All of these are handled correctly by doing an admin install. As to compression, there are actually three different compression algorithms used for the cab files inside the MSI file format: MSZip, LZX, and Storing (uncompressed).
Always prefer to run the actual admin install over any hacky zip extractions. Note that running an admin install versus using a zip tool to extract the files is very different! The latter will not adjust the media layout of the media table so that the package is set to use external source files - which is the correct way. This ensures that the source files are always available for any repair operations.
It is basically intended as a way to create a network installation point from which the install can be run on many target computers. This is called an administrative installation. MSI or Windows Installer has built-in support for this - the extraction of files from an MSI file.
There is built-in MSI support for file extraction (admin install)
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