Ethnic fermented foods, a staple in many cultural traditions, are a global culinary staple with numerous nutritional and physiological benefits. These foods are created through microbiological processes, including bacteria, yeasts, and molds, and are known for their unique flavors and textures. They promote gut health through probiotics, increase nutritional bioavailability, and reduce anti-nutrients like phytic acid, enhancing nutrient digestion. However, creating these foods presents challenges such as uniformity, microbial contamination, and balancing authenticity with modern food safety standards. Innovations in fermentation technology, such as regulated systems, starter cultures, and AI-enhanced optimization, are being explored to adapt traditional methods for industrial production while maintaining product quality. The global appeal of ethnic fermented foods is driven by their health benefits and growing consumer demand, and the influence of cultural exchange in promoting these cuisines. This chapter highlights the importance of ethnic fermented foods in conserving cultural heritage and improving global health through their nutritional and microbial benefits.