HDI Printed Circuit Board have a higher density of circuits per unit compared to traditional PCBs. Depending on the purpose, they are manufactured using various materials, such as FR4, metal, fiberglass, etc. In addition to microvias with a diameter of less than 0.006 inches, they also adopt buried vias and blind vias.
HDI technology in printed circuit boards and other areas has been a critical driver for developing many of the electronics we use today, especially those that have decreased substantially in size and weight in recent years. The smaller the equipment gets, the more likely it is to employ HDI technology