Here's a breakdown:

* Electrons: Atoms are made of protons, neutrons, and electrons. Electrons orbit the nucleus of the atom.

* Free Electrons: In some materials, electrons are not tightly bound to their atoms and can move freely throughout the material. These are called "free electrons".

* Conductors: Materials with many free electrons allow electricity (a flow of charge) to pass through them easily. This is because the free electrons can carry the electric current.

Examples of good conductors:

* Metals: Metals like copper, silver, and gold have a "sea" of free electrons, making them excellent conductors.

* Electrolytes: Solutions with dissolved ions (charged atoms) can also conduct electricity.

Non-conductors (Insulators):

* In insulators, the electrons are tightly bound to their atoms and cannot move freely. This makes them resist the flow of electricity. Examples include rubber, glass, and plastic.

So, in essence, the ability of a material to conduct electricity is determined by the number of free electrons it possesses. The more free electrons, the better the conductor.