This document provides an overview of localization testing for software. It defines localization as translating software products into different languages so they can be understood globally. The document discusses what localization involves technically and costs. It also outlines a typical localization testing checklist, how testing is carried out, common defects found, and best practices for overcoming localization challenges. The goal of localization testing is to ensure software works seamlessly for international users in their own languages and locales.