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Regarding Objective-C on iOS application, I read some sample program in the Apple developer website and I found that almost all of the applications contains a word called ‘NSBundle‘ and ‘mainBundle‘, and I really don’t understand the meaning of this word. What is that?
A bundle is a structure used for packaging software on Mac OS X. Applications, frameworks and plug-ins are all different kinds of bundles. Bundles may contain executable code, resources, header files and other stuff (including other bundles) if you so wish.
Bundles are implemented as directory trees with a defined structure. Applications, frameworks and plug-ins each have their own variation on the structure of the tree. However, to the Finder, bundles look like single files.
The main bundle is simply the bundle of the application that is running. So, for instance, the main bundle of the Apple mail program is /Applications/Mail.app.