Here's why:

* Insulators: Rubber is an excellent electrical insulator. This means it strongly resists the flow of electric current.

* Atomic Structure: The atoms in rubber have tightly bound electrons, making it difficult for electrons to move freely and carry an electrical current.

* Applications: This property makes rubber a vital material for electrical insulation in wires, cables, and various electrical equipment.

While rubber is the top contender for resisting electricity, other materials like glass, ceramics, and plastics are also good insulators.

It's important to remember that even "perfect" insulators can conduct electricity under extreme conditions like extremely high voltage.