ICU
ICU (International Components for Unicode) is an open-source library developed by the Unicode Consortium that provides robust and comprehensive support for Unicode and globalization in software applications. It includes functionality for text processing, locale-sensitive operations, date/time formatting, number formatting, and character set conversions, enabling applications to work seamlessly across different languages and regions.
Developers should learn and use ICU when building applications that require internationalization (i18n) and localization (l10n), such as web apps, mobile apps, or desktop software targeting global audiences. It is essential for handling multilingual text, supporting right-to-left scripts, performing accurate sorting and searching across languages, and ensuring consistent formatting of dates, times, and numbers according to cultural conventions.