As electronic devices become more complex, more and more parts are needed, and the lines and parts on the PCB are becoming more and more dense. The standard PCB is the bare board. Bare boards (no parts on top) are also often referred to as printed circuit boards or printed circuit boards.

PCB substrate is made of insulated, insulated, non-bendable material, the appearance can be seen in the small route material is copper foil, the original copper foil is covered in the entire board, and in the manufacturing process which part of the chemical Piezoelectric etching dissolves, leaving the part of the network to form a small line. These routes are called conductor patterns or wiring and are used to provide circuit connections for parts on the PCB.

In order to secure the parts on the PCB, they can be welded directly to the wiring. On the most basic PCB (single panel), parts are concentrated in one of the walls, the wires are concentrated in the other wall. So that the need to punch holes in the board, so that the feet can walk through the board to another wall, so the parts of the pin is welded on another wall. Because of this, the front and back of the PCB are called parts and welding surface.

If some parts on the PCB board need to be removed or removed after the production is complete, then the part will be installed when the socket (Socket). As the socket is directly welded to the board, the parts can be arbitrarily disassembly. The most common is the ZIF (Zero insertion Force) socket, which allows parts to be easily inserted into the socket and can be removed. The socket next to the socket can be fixed after you insert the part.

If you want to link two PCBs, generally used to commonly known as the "golden finger" side joints. Gold finger interface covered a lot of bright copper pad, these copper pad is actually part of the PCB wiring. Usually connected, one of the PCB on the gold finger into another piece of PCB on the appropriate slot (generally called the expansion of the full slot Slot).

Finally, the colors of the upper panel of PCB are generally green, brown, red, yellow, etc. These are the colors of solder (mask). This layer of color plays a protective and insulating role that protects the copper wires from short circuits. Usually in the solder layer will be a screen printing, usually printed text and symbols are basically white, used for marking.