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Metabolic networks are intricate systems of biochemical pathways that underlie cellular metabolism, providing a framework for understanding how cells sustain life through energy production, growth, and adaptation. This review examines the complexity and connectivity of these metabolic pathways, highlighting key processes such as glycolysis, the TCA cycle, the pentose phosphate pathway, fatty acid metabolism, and amino acid metabolism. It emphasizes the interdependence of these pathways and their regulatory mechanisms, which are crucial for maintaining metabolic homeostasis. Recent advancements in systems biology, metabolomics, and computational modeling have significantly enhanced our ability to map and analyze these networks. Understanding these interconnected pathways offers insights into cellular function and dysfunction, with implications for metabolic diseases and therapeutic interventions. This review aims to provide a comprehensive overview of the current state of knowledge in metabolic networks and their relevance to health and disease.