Why do so many programs have both a setup.exe and a setup.msi?

Question

I have always wondered about this. So many application setups have a zip file that you unzip, and in it are a bunch of files, among other things an exe and an msi. What is t

Answer 1

In very basic words,

you can deliver just the .msi file and it will install. but .exe will not work without the .msi