Can anyone explain me in brief about binaural beats. how this phenomenon is produced and what are its benefits?

The benefits are: brain sync; that is, the two hemispheres begin to oscillate at more and more of the same frequencies, usually starting in the occipital region (back of the brain) and "marching" forward to the frontal lobes (just behind and above the eves). This produces a subjective feeling of calm, controlled serenity--things long-term meditators experience. Very good for anxiety disorders...