A definition from MSDN says something like this: "A .NET Framework assembly containing resources specific to a given language. Using satellite assemblies, you can place the resources for different languages in different assemblies, and the correct assembly is loaded into memory only if the user elects to view the application in that language."
This means that you develop your application in a default language and add flexibility to react with change in the locale. Say, for example, you developed your application in an en-US locale. Now, your application has multilingual support. When you deploy your code in, say, India, you want to show labels, messages shown in the national language which is other than English.
Satellite assemblies give this flexibility. You create any simple text file with translated strings, create resources, and put them into the bindebug folder. That's it. The next time, your code will read the CurrentCulture property of the current thread and accordingly load the appropriate resource.
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