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All these files are created with default names. When you click “Save to Server” in the projects window, you’ll be prompted to name the file. Generally we will name it the project name, and any identifiers as needed (if there are multiple schematic pages, for example).
Terminology
Schematic - A drawing representing connections within a circuit
PCB - Printed circuit board, the physical board which makes the connections between all components
Net - A “network of connections”; a continuous piece of metal connecting pins
Symbol - The representation of a component within a schematic
Pin - One of the exposed electrical connections on a component
Pad - A piece of exposed copper on a PCB that will be soldered to the pin on a component
Footprint - An arrangement of pads on a PCB that matches the pins and allows a component to be soldered