True or False: Semiconductors are both good conductors and good insulators.

Semiconductors are materials that have electrical conductivity between that of conductors (like metals) and insulators (like rubber). They are not classified as both good conductors and good insulators at the same time. Their unique property is that their conductivity can be manipulated through various means, such as the introduction of impurities (doping) or changes in temperature, which allow them to behave more like good conductors under certain conditions.

In their pure state, semiconductors exhibit relatively low conductivity and do not perform well as conductors or insulators. However, by adding impurities, their conductive properties can improve significantly. This distinctive behavior differentiates them from typical conductors and insulators, confirming that they cannot be accurately described as both good conductors and good insulators simultaneously. Therefore, the statement is false.