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These reproduced sounds can be anything from the swishing of clothing and footsteps to squeaky doors and breaking glass. The best Foley art is so well integrated into a film that it goes unnoticed by the audience. It helps to create a sense of reality within a scene. Without these crucial background noises, movies feel unnaturally quiet and uncomfortable.   Wiki  
What's the point of this? 1) Recoding the ambient sound on a set is really difficult. In the video the Foley artist added a creaking sound to Russell Crowe's leather armor. In reality that noise probably wasn't any louder than the wind. 2) It wouldn't feel real. There's a scene in Miss Congeniality where Sandra Bullock stumbles in some high heals. In reality she probably just stumbled onto a mat (out of the camera frame), but the audio that was added made the stumble sound much more dramatic. 3) Sound may not be available. In the video you saw a car fly out the back of an airplane, which was certainly a CGI shot. No audio would have been available. 4) It's impractical. Even if they designed the set with hundreds of microphones to capture every little sound, it would limit where the cameras could be and it could distract the actors. 5) It gives more creative control. If every single sound is isolated on its own channel then sounds can be moved around, adjusted and completely removed if it doesn't fit the scene. reddit

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