Wikström's Theorem is a concept in the field of mathematics, specifically in the study of graph theory. It provides a framework for understanding the relationships between different structures within graphs. The theorem helps in analyzing how certain properties of graphs can be derived from their subgraphs, making it easier to study complex networks. The theorem is particularly useful in applications involving network design and optimization problems. By applying Wikström's Theorem, researchers can simplify their analysis of large graphs, leading to more efficient solutions in various fields, including computer science and operations research.