As LaTeX continues to serve a diverse global community of scholars, researchers, and professionals, the need for multilingual document preparation has grown significantly. Whether you are typesetting Arabic mathematical texts, Chinese research articles, or bilingual conference proceedings, LaTeX offers robust support for a wide range of scripts, writing systems, and language-specific typographic conventions. This chapter explores the essential tools and packages required for producing documents in non-Latin alphabets and multiple languages. We cover foundational concepts such as input encoding, font selection, and language switching, along with specialized packages like babel, polyglossia, CJKutf8, and arabtex. Additionally, we examine best practices for integrating multilingual content in both traditional and modern compilation workflows, including PDFLaTeX, XeLaTeX, and LuaLaTeX. By the end of this chapter, readers will be equipped to create polished, linguistically accurate documents that meet international publishing standards.