What is a high density PCB board (HDI PCB)?

The HDI board is based on the traditional double panel as the core board, which is made by continuously accumulating. This circuit board made by a continuous layer is also called the Build-Up Multilayer (BUM). Compared with the traditional circuit board, the HDI circuit board has the advantages of "light, thin, short, small". 

https://www.hitechpcba.com/hdi-pcb-manufacturer-high-interconnect-pcb-manufacturing

HDI PCB & High Interconnect PCB Manufacturing

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What is a high density PCB board (HDI PCB)?

The HDI board is based on the traditional double panel as the core board, which is made by continuously accumulating. This circuit board made by a continuous layer is also called the Build-Up Multilayer (BUM). Compared with the traditional circuit board, the HDI circuit board has the advantages of "light, thin, short, small".

https://www.hitechpcba.com/hdi-pcb-manufacturer-high-interconnect-pcb-manufacturing