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The document discusses Assembly Definition (asmdef) files in Unity. It begins by explaining that asmdef files are used to define Assembly configurations in a project. It notes some key points about asmdef files, including that they allow defining assemblies that can be referenced from other parts of a project. It also discusses different ways asmdef files can be structured, such as having one per script folder, one per assembly, or splitting assemblies for editor/playmode tests. Overall, the document provides an overview of what asmdef files are used for and important considerations around their usage and configuration in Unity projects.