Mainly by the circuit board pads, vias, mounting holes, wires, components, connectors, filling, electrical boundary, etc., the main function of each component are as follows:
Pad: welding components for metal pin hole.
Vias: vias with metal and non-metal vias, wherein the metal pin through-hole components used to connect between the layers.
Mounting holes: for fixing the circuit board.
Conductor: Cu films for electrical network connection components pin.
Connector: for connection between the circuit board components.
Padding: copper ground wire for network, can effectively reduce the impedance.
Electrical border: used to determine the size of the board, all the components on the circuit board can not exceed the boundaries.