on the top layer of the PCB and has the role of a reference indicator for the components on the PCB. Graphics and text on a circuit board's PCB are usually imprimate circuite printed with a non-conductive permanent epoxy ink. The color is usually white, although other colors are available: yellow, black, blue, red. Screen printing
circuit board made in recent years have greatly helped fields such as medicine and aeronautics to benefit from smaller and lighter equipment that circuite imprimate has allowed them a high degree of development and effectiveness. Today, in our house, almost every electronic device that helps us in the household contains a larger
multi-layer PCBs, the most common are the four-layer ones. The four-layer board imprimate circuite has many more routing options in the internal layers compared to the two-layer board, and often part of the internal layers are used as a ground plane or power plane, to achieve better signal integrity, higher signaling frequencies, and