Schematic diagrams can change depending on the type of Outcome being designed.
For web Design they could be wireframes.

A version of a wireframe could also be used to Design a Heads Up Display (HUD) for a video game.
It could also be a Unified Modelling Language (UML) diagram to show classes and how a program will operate.

Or it could be a network schematic showing the layout of a network or electronic circuit.





