If we want to connect two PCBs together, we will use the edge connector, which is usually called a golden finger. There are a lot of exposed copper pads on the golden finger that are actually part of the copper wire. The golden finger of a PCB will be inserted into the extended slot of another PCB. On your computer, such as an audio card, video card or other card that works in a similar way, you will use the golden finger to connect the motherboard.
The green or gray mask on the PCB is resistant to welding, it is the layer of insulation protection that not only protects the copper cable so that it does not get damaged during the subsequent process, but also prevents the electronic component from mounting on another suitable location. In the solder resistance layer, another layer will normally be printed through the screen, the designators will be printed through this layer and the color will be white to identify the location of each component. The silkscreen layer is also called Legend.
The cable of each component will be mounted on the PCB to correct them. And the most basic PCB, as we know, has components scattered all over the same side that we call the component side, while the copper wires are all concentrated on the other side of the PCB solder side.
Some of the components of the PCB must be removed or replaced frequently after the PCB assembly process, the socket will be asked to place this type of component, since the socket is mounted directly on the PCB board and You can remove it willingly. For this requirement, the ZERO INSERTION FORCE socket can be applied especially to the CPU. The best PCB assembly manufacturer is well versed with all the techniques to provide a high quality product for their clients.