<p>Microbial melanin, a natural pigment produced by diverse bacteria and fungi, has emerged as a sustainable and biotechnologically viable alternative to traditional sources. This review summarizes recent advancements in the field of microbial melanin, focusing on its biosynthetic pathways, production optimization strategies, challenges, and potential applications. It specifically highlights the pivotal roles of omics technologies and genetic engineering in elucidating biosynthetic mechanisms and enhancing yield. We first detail the different types of microbial melanin, along with the synthesis mechanisms and key intermediates of the three main biosynthetic pathways. Subsequently, the latest strategies for increasing yield are summarized, emphasizing cultivation parameters and biotechnological approaches. This review further explores the main analytical techniques for structural characterization and proposes potential applications of emerging technologies. Despite encouraging progress, this review also highlights the ongoing challenges and controversies in this field. Finally, we provide a perspective on future research directions, emphasizing the need to integrate synthetic biology, advanced analytical techniques, and comprehensive safety evaluations to bridge the gap between fundamental research and industrialization. This work aims to provide a comprehensive and critical reference for researchers in this rapidly developing field.</p>