Theory:

An electric current is the movement of electrons in an electric circuit. Within a conductor, however, electrons are not totally free to flow. The attraction of the atoms while moving holds them back. As a result, the resistance of a conductor slows the movement of electrons through it. A component that offers a low resistance is a good conductor.
 
A resistor is a conductor with a significant amount of resistance. A poor conductor is a component that has a higher resistance.
 
There is another category of material that does not conduct electricity. They are known as insulators. The resistance of an insulator is even higher.
Insulators:
The materials that do not allow the electric current to pass through them are called Insulators. They are poor conductors of electricity.
Example:
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Wood, rubber, paper, and plastic
The conductors and insulators play a major role in the safety of using electrical circuits.
 
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Electric socket with plugs
 
Apart from these, there is a special type of material with a unique conducting behaviour known as semiconductors.
 
Semiconductors:
Semiconductors have both conducting and insulating properties. Some of the examples are silicon, germanium, gallium arsenide, etc. They are mainly used in diodes, computer peripherals, etc.
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Diodes
 
Important!
Ohmic conductors are also known as linear conductors, which obey Ohm's law. All metals are good examples of ohmic conductors.
 
Non-ohmic conductors do not obey Ohm's law. Semiconductor devices are a good example of this type.