Why we need blind or buried vias in our layout ,What is the difference between microvias?
Blind and buried vias are very expensive in production, and are not much used. The advantage over common vias is that they allow for more densely populated boards, since the buried vias don't need space on the component layers.
Microvias can be through-hole or blind or buried, they are just small diameter holes which are laser drilled instead of mechanically.