Fungal infections, or mycoses, are caused by a limited number of fungi present in soil, plants, and animals. While most fungi are harmless, some cause diseases ranging from mild skin conditions to severe systemic infections, particularly in immunocompromised individuals. Common pathogenic fungi include Candida, Aspergillus, Cryptococcus, Trichophyton, and Histoplasma. These infections are classified as superficial, subcutaneous, or systemic and represent a growing global health burden, especially among those with weakened immunity. Fungal infections span a broad clinical spectrum, from localized cutaneous disorders to severe systemic illnesses with high morbidity and mortality. Their incidence has risen due to organ transplantation, chemotherapy, and immunosuppressive therapies. This review addresses taxonomy, classification, ecology, and epidemiology while emphasizing drivers such as climate change, antimicrobial resistance, and human behaviours. It underscores the need for rapid diagnostics, antifungal stewardship, vaccine development, and global surveillance to ensure effective prevention, early detection, and management.