A PCB, or Printed Circuit Board, is a flat board made of insulating material that connects electronic components. It has conductive pathways etched onto its surface, allowing electricity to flow between different parts of a device. PCBs are essential in almost all electronic devices, from smartphones to computers, as they provide a compact and organized way to connect various components. The design of a PCB can vary greatly depending on its purpose. Some PCBs are simple, with just a few connections, while others can be complex, containing multiple layers and intricate designs. Engineers use specialized software to create these designs, ensuring that the electronic circuits function correctly and efficiently.