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PCB stands for printed circuit board. It is used for connecting various electronic components like resistors, capacitors, transistors etc. the board is made of (FR4) material. A thin layer of copper is laminated on the FR4 fiber glass epoxy sheet which is known as copper clad.  On the copper clad the circuit which is to be made is printed with the help of some procedure. The PCB provides the mechanical support to the components and electrical connectivity between these components in proper manner. In early eras when the printed circuit board was not invented the electronic circuits were made with connecting wires between the components which was very laborious and time consuming process to make a circuit. as shown below.
  
 With the invention of PCB, you can make any type of electronic circuit very easily at your home. The PCB boards are widely used in making electronic devices like computer mother boards, mobile phone boards and even every single electronic device that have printed circuit board inside. The Diagram shows a printed circuit board.

PCB of 555 monostable circuit.