A schematic indicates connections in a circuit in a way this is clear and standardized. It is a way of speaking to other engineers precisely what components are concerned in a circuit in addition to how they may be connected. A great schematic will display issue names and values, and provide labels for sections or additives to assist talk the intended purpose. Notice how connections on wires (or "nets") are proven the use of dots and non-connections are proven without a dot. A pcb layout is the ensuing layout from taking a schematic with precise components and figuring out how they will bodily be laid out on a broadcast circuit board. To produce a pcb layout, you need to know the connections of additives, factor sizes (footprints), and a myriad of other residences (which include present day, frequencies, emissions, reflections, high voltage gaps, protection considerations, production tolerances, etc.).