A schematic diagram refers to a specific type of circuit diagram which utilizes standard electrical/electronic symbols instead of pictures to show how a circuit (or a part of it) works. Below is a standard 3-wire motor control circuit employing a normal short stop stop - start pushbutton channel working with a schematic diagram. (Momentary here means the button/switch you trigger will return to its default location once you physically let go of it, typically by a spring which compels the button/switch to do this.)
Here's a technical variant of a design diagram. The principle intent of this diagram is to demonstrate the logic (speaking to electrical control) of a circuit. This diagram is the one that I mainly come across in my line of work, and it's extremely effective for troubleshooting problems or learning the way the circuit functions. Some circuits are so enormous that most kinds of schematic diagrams need to be read in increments from book form (normally with coded numbers so info can be easier found). Again, here is the same exact circuit since the first two weeks, but looking at it in ladder form.
Here's another schematic diagram showing the identical circuit, components and connections and it seems different but they fall into precisely the exact identical category.
Consider it this way; a circuit structure is any sort of diagram which illustrates how a circuit functions where the most important goal is that the appropriate wiring of components and their connection to each other instead of physical location relative to each other or intending prototypes. Nonetheless, in some uses classifying diagrams can be difficult so accept this as overall information. I have discovered this is especially true when working with more complicated circuits and electronics. I'm likely to work with a more straightforward but typical industrial circuit because these circuit set ups are exactly the same, but nevertheless where you're able to see how each type of diagram indicates the function of the circuit in their own manners.
Pictorial design diagrams, or graphic circuit diagrams are essentially the exact identical thing with the exact same function, but they use pictures of components within the circuit instead of symbols. Again, here's the exact specific circuit (virtually except a controller was inserted and they're using conductors L1 and L3 instead of L1 and L2.
Less clutter, right? I've got enough information in all of these diagrams to know exactly what this circuit will do and where to search for issues. Hope that this helps. ( Note: don't confuse circuit or schematic diagrams with wiring diagrams; wiring diagrams will usually demonstrate pictures of elements like the pictorial, and also how the whole or portion of a circuit will be wired. The distinction is that wiring diagrams usually put an emphasis on real physical location of necessary elements relative to each other that basically tell a layman Just What to do concerning the wiring)