Brain entrainment is also known as brainwave entrainment because it deals mostly with brainwaves.
Here's how it works...
Let's say you've got a
tuning fork
that resonates at 440 Hz. So, you strike it and then hold another tuning fork, that also resonates at 440 Hz, next to it.
The second one will start resonating without doing anything to it.
This effect is called the "frequency following response".
The same thing applies to our brainwaves. If you listen to a series of tones designed to resonate at the frequencies of certain brainwaves, your brain will follow and start resonating accordingly.
These tones are called "binaural beats".
How can brain entrainment help me?
There are four basic states of consciousness detected by EEG machines. These states are called beta, alpha, theta, and delta. Each of these corresponds to certain frequency ranges.
People with a past history of epilepsy or seizures should NOT use brain entrainment because certain studies have shown that binaural beats can actually trigger seizures so if you have a prior history with either condition you must ask not use it or listen to it.
For everyone's safety I always indicate which tracks contain the brain entrainment for this purpose.