Here's another schematic diagram showing precisely exactly the same circuit, connections and components and it looks different but they fall into the identical category.
Consider it this way; a circuit diagram is any kind of diagram which demonstrates the way the circuit operates where the most important goal is that the proper wiring of elements and their connection to each other rather than physical place relative to each other or planning prototypes. Nevertheless, in some uses classifying diagrams can be difficult so choose this as overall advice. I've found this is particularly true when dealing with much more complicated circuits and electronics. I'm going to work with a more straightforward but average industrial circuit because these circuit set ups are exactly the same, but where you can see how each sort of diagram indicates the role of the circuit in their own ways.
Here's a version of a design diagram called a ladder design. The principle point of this diagram will be to show the logic (speaking to electrical control) of a circuit. This diagram is the one that I mostly come across in my line of work, and it's extremely effective for troubleshooting issues or learning how a circuit functions. Some circuits are so enormous that most types of schematic diagrams need to be recorded in increments in book form (generally with coded numbers so info can be easier found). Again, here is the same specific circuit because the first 2, however, considering it in ladder shape.
Less mess? I've got enough information in each these diagrams to know precisely what this circuit does and where to look for problems. Hope this helps. ( Note: do not confuse lecture or circuit diagrams with wiring diagrams; wiring diagrams will typically demonstrate images of components such as the pictorial, and also how the entire or portion of a circuit has been wired. The distinction is that wiring diagrams typically place an emphasis on actual physical location of necessary elements relative to each other that essentially tell a layman Just What to do about the wiring. )
A design diagram refers to a specific kind of circuit structure that utilizes standard electrical/electronic symbols rather than pictures to show the way the circuit (or part of it) functions. Below is a standard 3-wire motor controller circuit using a typical short stop stop - start pushbutton station employing a schematic diagram. (Momentary here means the button/switch you activate will return to its default place once you let go of it, typically by a spring which forces the button/switch to get this done.)
Pictorial schematic diagrams, or pictorial circuit diagrams are essentially the exact same thing with exactly the same function, however they use images of elements inside the circuit rather than symbols. Again, here's the same precise circuit (almost except a control transformer was included and they are using conductors L1 and L3 rather than L1 and L2.