Question

what is a semiconductor?

Answer 1

a solid substance that has the conductivity between that of an insulator and that of most metals are the due to the addition of the impurity or because of the temperature effects
device is made of semiconductors notably Silicon are essential component of the most of the electronic circuits it is mostly used in computer industry

Answer 2

Semiconductors are used extensively in electronic circuits. As its name implies, a semiconductor is a material that conducts current, but only partly. The conductivity of a semiconductor is somewhere between that of an insulator, which has almost no conductivity, and a conductor, which has almost full conductivity.