What is Electrostatic Shielding? - QS Study
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Electrostatic shielding is the process of isolating a certain region of space from external field. It is based on the fact that electric field inside a conductor is zero. Electrostatic shielding is the best way to protect some area in vacuum from the influence of external electric field.

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During a thunder accompanied by lightning, it is safer to sit inside a bus than in open ground or under a tree. The metal body of the bus provides electrostatic shielding, where the electric field is zero.

During lightning the electric discharge passes through the body of the bus.

Application: Microwave ovens surround energy within itself, shielding the outside from harmful radiation.