Complex systems in systems biology, neuroscience, geomorphology, ecology, and social sciences are commonly represented as networks to study their interconnections. Nodes and links represent key elements and relationships, such as genes or enzymes in metabolic pathways, neurons or brain areas, spatial points in landscapes, habitat patches, and individuals in groups, incorporating specifics like link directionality, weights, spatial aspects, and community detection.
Transportation planners use network theory to design efficient subway systems by optimizing station connections and identifying critical transfer points that affect overall passenger flow.
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