There has been a continued improvement in the internet accessibility all around the world. This has led to the continued development of websites. As one of the consequences, it is now very easy to get a ready PCB Online, just for the intended use.
Photolithography(also called: Lithography) is an important step in manufacturing process of semiconductor device, the steps of using exposure and development describe the geometric structure in the photoresist layer, then etching the photomask pattern on the transfer to the substrate.
A Via is simply a copper plated hole that connects two or more copper layers. Vias are very useful for efficiently making complex multilayer PCBs, highly populated with electronic components over a small PCB area.
One thing to note about PCB Prototyping is that it is different from PCB Manufacturing. PCB Prototyping is characterized by changes, while PCB Manufacturing involves mass production of the same design. Before you commission your PCB design for mass production, it is best for you to pass it through PCB Rapid Prototyping.