In a series circuit, all components are connected on one line. This means that the voltage is shared between every component equally making it useful for supplying low power things, for example fairy lights. However, as the components are connected along one line, they can not be individually turned on, you can turn on all or none. Also, if one component breaks, the rest of the circuit will not work.
The circuit diagram above shows a circuit with two lamps connected in series. If one lamp breaks, the other lamp will not light.
Parallel
In a parallel circuit different components are connected separately to the supply. This means that, unlike in a series circuit, if one component breaks the other components can continue being powered as the whole circuit can still function. This makes it useful for powering objects that require a high power things as the voltage is equal throughout the circuit (therefore, each component receives the full voltage).
The circuit diagram above shows a circuit with two lamps connected in parallel. If one lamp breaks, the other lamp will still light.
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