What is meant by magnetic screening or shielding?

Explanation

### Step-by-Step Solution:

1. **Definition of Magnetic Screening/Shielding**:
Magnetic screening or shielding refers to the process of protecting sensitive devices or areas from external magnetic fields. This is achieved by using materials that can block or reduce the magnetic field strength in a specific region.

2. **Mechanism of Shielding**:
When a magnetic field is applied to a material that is capable of shielding, the material will respond by creating its own magnetic field that opposes the external field. This results in a reduction of the magnetic field strength within the material.

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