It is a material that conducts current, made of certain materials, most commonly silicon.
There are two types of materials: conductors, which conduct electricity, and insulators, which do not, and semiconductors are materials with properties in between.
A semiconductor is a material with properties in between the two, but gold, silver, and copper are examples of materials that conduct electricity easily.
Insulators are rubber, glass, ceramics, etc., which have high resistance and do not allow electricity to pass through.
Semiconductors, which have properties in between these two, change their electrical resistance depending on temperature. At low temperatures, they conduct very little electricity, but as the temperature rises, they conduct electricity more easily.
These properties are very useful in controlling many electrical appliances.
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