The capacitors, friendly named capa or cap, are energy storage components. You can store power into capa as you will store water in water reservoir then consuming this energy when needed. Without surprise, you will find Capacitor in motor based assemblies, wave transmission systems and power regulation. The capacitor also have this nice feature of stopping DC current while allowing alternative signals to flow through. So, we also find capacitor into audio circuitery and as filtering tool (since parasitic and spikes are alternative signals with a very very very high frequency... infinie frequency). As you may guess, impossible to create electronic project without CAPs.
5 Capacités Electrolytique de 1 µF - 50v
10 Capacités Céramiques de 0.1 µF - 50v - filtrage alimentation
10nF = 0.01µF