A product breakdown structure is a hierarchical representation of a product, displaying its various components and their relationships. However, there are several synonyms for this term among industries and organizations worldwide. These include Product Hierarchy, System Breakdown Structure, Bill of Materials (BOM), Component Tree, and Assembly Chart. While these terms may differ in minor ways, they all refer to the same fundamental idea: breaking down a product into its constituent parts to gain a better understanding of the design, manufacturing, or assembly process. Regardless of which synonym is used, the goal is always the same-to simplify complexity and promote efficient product development.