A: A single-sided PCB (Printed Circuit Board) is a circuit board with electronic components and circuit traces located only on one side of the board. In contrast, a double-sided PCB has components and traces on both sides of the board. Single-sided PCBs are simpler and generally easier to design and manufacture than double-sided or multi-layer counterparts.

On a single-sided PCB, components are mounted on one side of the board, and the interconnections between the components are made using conductive traces, usually made of copper, on the same side. These traces allow electrical signals to flow between components and form the desired circuit.

Single-sided PCBs are often used for relatively simple electronic devices with fewer components and less complex circuitry. They are also cost-effective and suitable for applications with less critical space and complexity constraints. However, because all the components and traces are on one side, single-sided PCBs may require more board space and larger physical dimensions than double-sided or multi-layer PCBs, allowing for more compact designs.

In summary, a single-sided PCB is a circuit board type with components and traces located only on one side of the board, making it suitable for simpler electronic designs and less complex applications.