Multilingual SEO is the practice of optimizing website content in multiple languages to improve search engine visibility across diverse linguistic audiences. It involves translating and localizing keywords, meta tags, URLs, and content while maintaining cultural relevance and search intent. Effective multilingual SEO ensures that each language version of a site is properly indexed, avoids duplicate content issues, and targets region-specific search engines. Implementing hreflang tags, choosing the right domain structure, and using geo-targeting are essential strategies. Multilingual SEO expands global reach, boosts organic traffic, and enhances user experience by delivering content that resonates with users in their native language.