What is the definition of a schematic diagram?

A schematic diagram is defined as a representation that shows the relationships and connections between different parts within a system. This type of illustration is primarily used to depict how components interact with each other, often highlighting the electrical or functional relationships rather than providing precise geometrical or physical representations.

In contrast to other options, detailed 3D models focus on visualizing spatial relationships and dimensions, which goes beyond the abstract relationships intended in schematic diagrams. Similarly, a type of projection used in drafting relates to the methods of depicting 3D objects on 2D surfaces, which does not emphasize the relational aspect inherent in schematic diagrams. Lastly, a blueprint for construction is a technical drawing that provides specific dimensions, materials, and construction details, while a schematic diagram communicates information at a more conceptual level, without the intricacies of construction overviews.