There are five different brain waves:
Delta: 1-4 Hz. Delta is the lowest frequency state, and it’s linked to:
- Deep sleep
- Healing and pain relief
- Meditation
- Anti-aging: cortisol reduction/DHEA increase
- Access to the unconscious mind
Theta: 4-8 Hz. Theta binaural beats benefits include:
- Meditation
- Deep relaxation
- Creativity
Alpha: 8-14 Hz. When you are in an alpha state of mind, your brain is focused and productive. Alpha brain waves help you to:
- Relax and focus
- Reduce Stress
- Maintain positive thinking
- Increase your learning capabilities
- Easily engage in activities and the environment because you are in a state of flow
Beta: 14-30 Hz. Beta is a higher frequency brainwave and helps in:
- Keeping your attention focused
- Analytical thinking and solving problems
- Stimulating energy and action
- High-level cognition
Gamma: 30-100 Hz. With a higher frequency than beta, these brain waves help in:
- Increased cognitive enhancement
- Attention to detail, helping in memory recall
- A different way of thinking, which is a sign of creativity
From: https://www.webmd.com/balance/what-are-binaural-beats

Figure from https://www.researchgate.net/figure/Diagram-showing-how-binaural-beat-works_fig1_357293575
More: https://en.wikipedia.org/wiki/Beat_(acoustics)#Binaural_beats