Why Microwave Oven Has a Metal Mesh?

Have you ever wondered, why is there a metal mesh over the glass window of the microwave oven?

The mesh is there for an important reason:, It keeps the microwaves from escaping the oven through the glass. You might already know that microwaves can't pass through metal, and that's why you should not put any kind of food containers containing metal in the microwave. This is also the reason the microwave oven is fully covered in metal, making it a Faraday cage. Faraday cage is a structure, that either traps or keeps out electromagnetic waves.

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