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The air high above the surface of Earth in less dense that air near the surface, and as a result, its pressure is much lower that at the surface. So, the cabins of airplanes are pressurized to prevent the pilot and passengers from passing out, because of lack of air. The pressure of air on the surface, but more than outside air at high altitudes.
As a plane rises, the air pressure decreases, and the air trapped in your inner ear will cause your eardrums to push outward, causing some discomfort. your body equalize the pressure between your inner ear and the atmosphere by allowing some air from your inner ear to escape through two small channels called the Eustachian tubes, that connect the inner ears to the throat, one on each, side. As the pressure is released, you will hear a 'popping' sound.
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