Cultural heritage, biodiversity, and ecological sustainability form the foundations of indigenous and traditional food systems. These systems are intrinsically linked to local ecosystems and resources, incorporating microorganisms into the creation, storage, and enrichment of food products. Microorganisms play a vital role in food production, preservation, and improvement, through processes, such as fermentation, biopreservation, and bioprocessing. The utilization of these microorganisms in food systems contributes to improved food security, nutritional value, and health benefits for the native populations. This chapter delves into the significance of microorganisms in established food processing methods, such as fermentation, biopreservation, and bioprocessing. These techniques play a crucial role in enhancing food safety, increasing product longevity, and improving nutritional value. Probiotic microorganisms and bioactive substances in fermented foods promote digestive health, whereas biopreservation methods help reduce food spoilage and minimize waste. These practices are not only culturally significant but also have economic and environmental benefits, offering sustainable alternatives and helping to maintain biodiversity. Integrating traditional knowledge with modern science can foster innovation, thus making these practices relevant to contemporary global food challenges.