What are the uses of power board PCB?

The power board PCB is mainly composed of pads, vias, mounting holes, wires, components, connectors, fillers, electrical boundaries, etc. The main functions of each component are as follows:
1. Pad: A metal hole for soldering component pins.
2. Vias: metal holes used to connect component pins between layers.
3. Mounting hole: used to fix the printed circuit board.
4. Conductor: Electrical network copper film used to connect component pins.
5. Connector: a component used for connection between circuit boards.
6. Padding: The copper used in the ground net can reduce impedance.

7. Electrical boundary: used to determine the size of the circuit board. All components on the circuit board cannot exceed this boundary.