Pictorial schematic diagrams, or pictorial circuit diagrams are essentially the exact identical thing with the exact identical function, however they use images of components inside the circuit instead of symbols. Again, here is the same specific circuit (almost except a controller was included and they are using conductors L1 and L3 rather than L1 and L2.
A schematic diagram refers to a particular kind of circuit diagram which uses standard electrical/electronic symbols instead of images to show how a circuit (or part of it) works. Below is a normal 3-wire motor controller circuit utilizing a normal momentary stop - start pushbutton station employing a schematic diagram. (Momentary here means that the button/switch you trigger will return to its default position once you physically let go of it, typically by a spring that forces the button/switch to do this.)
Here is another schematic diagram showing precisely exactly the identical circuit, components and connections and it looks different but they both fall into exactly the exact identical category.
Here is a specialized variant of a diagram. The principle aim of this diagram will be to show the logic (referring to electric control) of a circuit board. This really is the one that I mainly encounter in my line of work, and it is very successful for troubleshooting issues or learning how a circuit works. Some frequencies are so enormous that most types of schematic diagrams have to be recorded in increments from book form (normally with coded numbers so that info can be simpler found). Again, here is the identical specific circuit as the first two, however, considering it in ladder shape.
Much less mess, right? I have enough info in every one these diagrams to know just what this circuit does and also where to look for issues. Hope that this helps. ( Note: don't confuse lecture or circuit diagrams together with wiring diagrams; wiring diagrams will often show pictures of elements such as the pictorial, and also how the entire or portion of a circuit is wired. The distinction is that wiring diagrams usually put an emphasis on actual physical place of necessary components relative to each individual that essentially tell a layman Just What to do about the wiring)
Consider it in this way; a circuit diagram is any type of diagram that demonstrates the way the circuit functions where the major goal is that the proper wiring of components and their relationship to each other instead of physical location relative to each other or intending prototypes. Nonetheless, in some uses Assessing diagrams can be challenging so take this as general advice. I have found this is particularly true when dealing with much more complex circuits and electronic equipment. I'm likely to use a simpler but typical industrial circuit because these circuit set ups are exactly the same, but yet where you're able to see how each kind of diagram indicates the purpose of the circuit in their own manners.