Mac classic had full compiled applications that you would drag to your applications folder. This is the same when it's distributed by dmg and told you are to dr

Mac classic had full compiled applications that you would drag to your applications folder. This is the same when it's distributed by dmg and told you are to drag to the Applications folder and using Sparkle on this is a common method to update or to just give another dmg. Another way you can distribute your app is to use a dmg to with a pkg file in it and this launches an installation wizard very similar to what you would see on windows. Then there is homebrew that has a series of ruby formulas that can do nearly all of the above. Obviously there is the Mac App Store.