Question

What is ventilation

Answer 1

Ventilation means free flow of fresh air into our home and outlet of dirty air.We need to breath in clean air to remain healthy.
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Hope this helps!
KGB

Answer 2

Ventilation is known as a process that aids in the removal of stale, inside air from any building, room or such confined space by replacing it with outer natural and fresh air.

Ventilation is an important process as it is essential for breathing.

Ventilation is helpful since we know that the oxygen level is  reduced in an inhabited area, thus, dilution of air pollutants, smoke or odor, controlling the humidity and temperature within the space becomes very important.

It is also required to allow a supply of oxygen, to help in processes like combustion and cooling.