As the airplane goes higher, the oxygen levels in the plane decrease too. Hence, to maintain a stable oxygen level in the airplane, the cabin needs to be pressurized so that the passengers and the cabin crew can breathe normally.

On the other hand, too much pressure is bad for the aircraft, and there is a need to release that extra pressure. This is why there are bleed holes, which is the name of the tiny holes on the airplane windows. You may notice 3 panes of plexiglass. The innermost glass is the one you can touch and is meant to protect the middle and outer panes. And the other glass is designed in a way to hold the difference in air pressure which is between the cabin and the air outside. This tiny hole balances the 2: cabin pressure and outside air.

It also helps in releasing moisture and preventing frost or condensation that blocks your view.

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