Semiconductors help to transmit conductivity between insulators and conductors. They can be in natural forms or may be a manufactured electronic.
Semiconductors are naturally found in nature. Elements like germanium and silicon are considered semiconductors. Compounds like cadmium selenide or arsenide are also semiconductors. Making minor changes to these elements or compounds can greatly change their ability to transmit conductivity.
Semiconductors are essential to the operations of electronics like microwave ovens, radios, watches and telephones. This is because when semiconductors are manufactured, it's easy to control the amount of electricity that they transmit, which contributes to the overall function of the device. Because of this, they are essential to the functions of key materials like circuits and transistors.