Internationalization- It is the process in which the application is designed in such a way that it can support any language, date-time, currency or any other value without making any modification in the code base. So it means you are coding in such a way that when you need to support any new language by providing Resource files or different locale it works automatically with that.
Localization - If the Internationalization is achieved, then localization is the process of introducing a new locale for your application usage, that is now you are creating a new language pack with the help of resource files as soon as it is integrated with your application, your application will start working with that specific culture, locale or language.
Globalization - Altogether, Internationalization and Localization is known as Globalization. You can say that your application is globalized once you achieve both.

Globalization : Is the complete process making your application available in all languages

I18N — is the process of desigining ur product so it can perform with different languages and localities

L10N — Is the process of custmizing ur product with respect to region and language selected