Single Sided PCB
These are the simplest printed circuit boards. Single-sided printed circuits do not require plating through holes and have a circuit only on copper layer.
Double Sided PCB
when fabricating double-sided boards, through-holes are usually required between the top and bottom pads
Flexible PCB or FPC is a patterned arrangement of printed circuitry and components that utilizes flexible based material with or without flexible coverlay.
Rigid-flex PCB are the electronic boards using a combination of flexible and rigid PCB board technologies in an application.
Multilayer PCB is the circuit board with more than two layers, such as 4 layers, 6 layers, 8 layers, 10 layers etc.
A Metal Core Printed Circuit Board (MCPCB), also known as a thermal PCB or metal backed PCB, is a type of PCB that has a metal material as its base for the heat spreader portion of the board.