Here's why:

* Structure: Paper is made of cellulose fibers, which are primarily composed of carbon, hydrogen, and oxygen. These materials have tightly bound electrons, making it difficult for electricity to flow through them.

* Resistance: Paper has a very high electrical resistance, meaning it strongly opposes the flow of electric current. This is why it's used in electrical insulation.

* Applications: Paper is used in many applications where electrical insulation is crucial, such as in electrical wiring, capacitors, and other electronic components.

However, there are some exceptions:

* Damp paper: If paper becomes wet, its conductivity increases significantly as water acts as a conductor. This is why it's important to keep electrical devices and paper away from moisture.

* Special types of paper: There are some specialized types of paper, such as conductive paper, that are designed to be conductive for specific applications.

In summary: While paper is generally a good insulator, it's important to consider the presence of moisture and the specific type of paper when determining its electrical conductivity.