Hyphae are thread-like, filamentous structures that are fundamental components of the vegetative body of certain fungi. These specialized filaments constitute the mycelium, which is the primary feeding and growth structure of the organism. The structure of the hyphae varies among fungal types; some are septate, meaning they are divided into distinct compartments by cross walls, while others are coenocytic, forming continuous tubular networks. The function of these filaments is crucial for nutrient acquisition, allowing the organism to penetrate substrates, secrete digestive enzymes, and absorb dissolved organic matter. Hyphae are responsible for the physical expansion and nutrient capture that supports the metabolic life cycle of the fungus.