* Conductors: Allow electricity to flow easily through them. This is because they have free electrons that can move readily. Examples include metals like copper, silver, and gold.
* Insulators: Resist the flow of electricity. They have tightly bound electrons that are difficult to move. Examples include rubber, glass, and plastic.
Think of it like a pipe:
* A conductor is like a wide-open pipe, allowing water (electricity) to flow easily.
* An insulator is like a tightly sealed pipe, preventing water (electricity) from flowing.
However, some materials can be semi-conductors, which have properties between conductors and insulators. Their conductivity can be changed by adding impurities or applying voltage. These are crucial for modern electronics.
