Which material is a common example of a semiconductor?

Silicon is a widely known semiconductor material due to its unique electrical properties. Semiconductors are materials that have a conductivity level between that of conductors and insulators. Silicon has the ability to conduct electricity under certain conditions, such as when it is doped with impurities, which enhances its conductivity. This makes silicon an ideal choice for use in electronic devices like transistors and diodes, which are fundamental components in modern electronics. Other materials in the options presented, such as copper, gold, and aluminum, are excellent conductors and do not exhibit the same semiconductor characteristics that silicon does, making them unsuitable for similar applications in electronics.