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A CADD (Computer-Aided Design and Drafting) file is categorized as a vector data structure because it primarily contains graphical elements that are defined by mathematical formulas, such as points, lines, curves, and polygons. Vector data structures represent objects through coordinates in a two-dimensional or three-dimensional space, allowing for precision in design and modification without loss of quality.

In the context of geographic information systems (GIS) or design software, vector data is advantageous for representing features like roads, boundaries, and other linear or area delineations. Each element in a vector format can be edited individually, which adds to its utility in CAD applications.

In contrast, raster data structures represent images as a grid of pixels, where each pixel corresponds to a specific value or color. Metadata structures refer to information about the data itself, such as descriptors or context, rather than the actual data representation. The categorization of CADD files as vector data underscores their use in detailed design work, where precision and scalability are crucial aspects.