Classify the following passage using two labels that best describe it.
Semiconductors are materials that can be either insulators or conductors, depending on their impurity levels.
Technology, Materials Science
Complete the following task based on the instruction and optional input provided.### Instruction:
Classify the following passage using two labels that best describe it.

### Input:
Semiconductors are materials that can be either insulators or conductors, depending on their impurity levels.

### Output:
Technology, Materials Science