Blind Via:
A blind via is a copper plated hole that is interconnected to only one external layer of the PCB. However, it is important to know that the hole does not go all the way to the board, making it “blind” or “invisible” to the naked eye.
Buried Via:
A buried via connects at least two layers without going to the outer edges of the board. So it is buried within the circuit and completely internal.
HDI PCBs:
HDI as a printed circuit board with a higher wiring density per unit area than conventional printed circuit boards (PCB).
