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A binaural beat is a perceptual effect that occurs when each ear receives a steady tone at a slightly different frequency. Listeners perceive a third “beat” corresponding to the frequency difference. To ensure the brain effectively creates the desired third beat, the left and right audio channels need to remain separated, so headphones are required.
Specific beat frequencies are commonly paired with various physical and psychological states, such as relaxation, focus, or deep sleep. Remember, experiences vary from person-to-person, so treat your explorations as an experiment: keep volume moderate, take breaks, journal your sensations and your finding, and most importantly: stop if you feel discomfort.
* Frequency ranges and associated states are approximate and vary across scientific and cultural contexts.