Pictorial schematic diagrams, or pictorial circuit diagrams are basically the same thing with the same purpose, but they use pictures of elements inside the circuit rather than symbols. Again, here's the exact identical specific circuit (virtually except a controller was added and they are using conductors L1 and L3 rather than L1 and L2.
Here's another schematic diagram showing precisely exactly the same circuit, components and connections and it looks different but they fall into exactly the exact same category.
Consider it in this way; a circuit diagram is any kind of diagram that demonstrates how a circuit functions where the main goal is that the appropriate wiring of elements and their relationship to each other rather than physical location relative to one another or planning prototypes. However, in some uses classifying diagrams can be difficult so accept this as overall advice. I've discovered this is especially true when dealing with much more complex circuits and electronic equipment. I'm likely to use a more straightforward but typical industrial circuit since these circuit setups are exactly the same, but where you're able to see how each sort of diagram indicates the operation of the circuit in their own ways.
Less mess, right? I have enough info in every one of these diagrams to know precisely what this circuit will do and where to look for issues. Hope that this helps. ( Note: do not confuse lecture or circuit diagrams together with wiring diagrams; wiring diagrams will usually show images of components such as the pictorial, and the way the entire or portion of a circuit will be wired. The difference is that wiring diagrams typically put an emphasis on real physical place of necessary elements relative to each individual that basically tell a layman Just What to do about the wiring)
A schematic diagram refers to a specific sort of circuit diagram that utilizes standard electrical/electronic symbols rather than images to show how a circuit (or portion of it) functions. Below is a standard 3-wire motor control circuit using a typical momentary stop - start pushbutton station using a schematic diagram. (Momentary this means that the button/switch you activate will return to its default location once you let go of it, usually by a spring that forces the button/switch to do this.)
Following is a specialized version of a design diagram known as a ladder structure. The principal purpose of this diagram will be to show the logic (speaking to electric management ) of a circuit board. This diagram is the one I mainly encounter in my own line of work, and it's extremely successful for troubleshooting issues or learning how a circuit functions. Some frequencies are so huge that most types of schematic diagrams have to be recorded in increments in book form (normally with coded numbers so that information can be simpler found). Again, here is the exact specific circuit as the first 2, however, considering it in ladder type.