Here's why:
* Conductors allow electrons to flow freely through them. This free flow of electrons is what constitutes an electric current.
* Insulators, on the other hand, resist the flow of electrons, making it very difficult for electricity to pass through them.
Some common examples of conductors include:
* Metals (copper, silver, gold)
* Water (especially if it contains impurities)
* Graphite (a form of carbon)
* Some solutions (like saltwater)
Let me know if you have any other questions!