Single Side PCB
Single-Side PCB is the simplest and most common type of PCB. It was the first device used for the interconnection and assembly of electronic components forming a cohesive and functional operating system. The primary industry that uses these boards is the consumer electronics industry.
Double Side PCB
Double Side PCB have made circuit in 2 layers of different PCB side that both layers has connect by via PTH (Plated Through Hole) which depend on design this is more complex than Single Side PCB