Here are some common examples:

* Metals: Copper, silver, gold, aluminum, iron, etc. These are the most common conductors.

* Electrolytes: Solutions that contain ions, such as salt water, battery acid, etc.

* Plasma: Ionized gas, like the Sun or lightning.

* Graphite: A form of carbon with free electrons.

It's important to note that even conductors have some resistance to the flow of current. This resistance is measured in ohms.