A schematic diagram refers to a specific sort of circuit design which utilizes standard electrical/electronic symbols rather than images to show how a circuit (or a portion of it) works. Below is a normal 3-wire motor controller circuit employing a standard momentary stop - start pushbutton station utilizing a schematic diagram. (Momentary this means that the button/switch you activate will go back to its default location once you physically let go of this, usually by a spring which compels the button/switch to get this done.)
Here is another schematic diagram demonstrating precisely exactly the same circuit, connections and components and it appears different but they both fall into exactly the exact identical category.
Consider it this way; a circuit diagram is any sort of diagram that illustrates the way the circuit functions where the major goal is that the proper wiring of elements and their relationship to each other instead of physical location relative to one another or planning prototypes. Nonetheless, in some uses classifying diagrams can be difficult so consider this as general information. I've discovered this is especially true when dealing with much more complex circuits and electronics. I'm likely to use a simpler but typical industrial circuit since these circuit setups are exactly the same, but where it is possible to see how each kind of diagram shows the operation of the circuit in their own manners.
Much less clutter, right? I have enough info in all these diagrams to know exactly what this circuit does and where to search for problems. Hope this helps. ( Note: don't confuse lecture or circuit diagrams together with wiring diagrams; wiring diagrams will typically demonstrate images of components such as the pictorial, and also the way the whole or part of a circuit has been wired. The difference is that wiring diagrams generally place an emphasis on actual physical place of necessary components relative to each other that basically tell a layman Just What to do about the wiring)
Here is a specialized variant of a design diagram known as a ladder diagram. The main goal of this diagram will be to show the logic (speaking to electric management ) of a circuit board. This diagram is the one that I mainly encounter in my own line of work, and it is extremely successful for troubleshooting problems or learning the way the circuit functions. Some frequencies are so huge that many 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 specific circuit since the first 2, however, considering it in ladder form.
Pictorial schematic diagrams, or graphic circuit diagrams are essentially the identical thing with exactly the exact identical purpose, but they use pictures of elements inside the circuit instead of symbols. Again, here's the same precise circuit (virtually except a controller was added and they are utilizing conductors L1 and L3 instead of L1 and L2.