A PCB is an abbreviation of printed circuit board. It is hardware used in electronics and many other industries to connect the electronic components of a scheme and mechanically support them. Connection is ensured using thin conductive copper traces printed on a board made of non-conductive material.
Printed circuit boards are divided into single layer and multilayer PCB. In modern day electronics space is one of the most important factors. Basically, multilayer PCB saves space because it can hold electronic components on both sides.
Multilayer PCB is a very important hardware element and it is almost certain you will find one in a wide array of devices starting from a mobile phone and TV, ending with military machines and space ships.
Although the materials and requirements change from industry to industry, generally, these boards are cheap and reliable. It would be hard to imagine assembling any gadget without using at least one multilayer PCB.
Choosing the wrong multilayer PCB manufacturer can be disasterous and can potentially stop you progress for months. Also, PCBA manufacturing should only be left to experienced companies in order to achieve success.