A single-layer PCB (1 layer PCB) has conductive material (copper) on one side, while a double-layer PCB (2 layer PCB) has conductive material on both sides, separated by an insulating core. 2-layer PCBs offer more routing flexibility and complexity than single-layer boards, allowing for more connections and components. 

Single-layer PCBs are typically used for simple electronic devices like remote controls and basic sensors. They are easy to manufacture and cost-effective for basic circuits. 

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