This document discusses localization strategies for multi-platform apps. It defines internationalization as making an app adaptable to different languages and cultures, while localization is the process of translating an app into multiple languages. For Android and iOS, it recommends using the same keys for strings to simplify and reduce the cost of localization. The document also provides tips for effective localization like using formatters instead of string concatenation and choosing a translation service that provides fast, high-quality translations by native speakers at an affordable price.