The air pressure above the wing is reduced by the shape of the wing. The difference in pressure between below and above the wing causes a force which pulls/pushed the wing (and the attached plane) into the air. I’m sure @Andres has a better answer than me though!
Andy pretty much said everything already! I could add that the engines give aeroplanes the thrust they need. The engines is what make them move forward, which brings air to the surfaces of the wings, and like Andy said, the pressure differential generates lift.
If the aircraft have no engines, like gliders, another aeroplane tows them and then they just descend back to the airfield.
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