What is electrostatic shielding?

Explanation

### Step-by-Step Solution:

1. **Definition of Electrostatic Shielding**:
Electrostatic shielding is a phenomenon where a conductor can block the electric field from penetrating its interior. This means that if a conductor is placed in an external electric field, the electric field inside the conductor will be zero.

2. **Understanding the Concept**:
When a conductor is exposed to an external electric field, charges within the conductor rearrange themselves. The free charges on the surface of the conductor move in such a way that they create an opposing electric field that cancels the external electric field inside the conductor.

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