The Bhramari pranayama breathing technique gets its name from the black Indian bee called Bhramari. Bhramari pranayama calms down the mind, calms anxiety, and controls anger. This simple technique can be practiced anywhere making it an excellent way to de-stress yourself. The exhalation sounds like the buzzing of a bee.
Firstly, make sure to sit in a comfortable upright, seated position. Secondly, the spine is nice and straight. Further more, place the hands gently on your knees. In addition, you have your legs folded, or if this is too hard, straight in front of you. Most importantly, keep your pelvis slightly tilted forward. You can sit on a block or bolster to support this pelvic tilt.
After that, we inhale through the nose and exhale through the nose. Likewise, we do so with a vibration that is directed to the cranial plate, where the frontal lobe sits. The exhalation is always longer, The breathe ratio is 1:2.
Hum gently, making sure to keep the mouth and jaw relaxed.
To sum it up, the kids love this one! They can experiment with high humming, low humming, quiet humming. Meanwhile, visualizing themselves as bee's collecting nectar. Its a cute thing to watch and to hear. And, because of this I always include it in kids yoga classes. Just make sure to remind them to keep their mouth and jaw relaxed. Having a room full of kids perform this pranayama sounds amazing. It's fun and helps them center, preparing them for a grounded practice of yoga. Adults benefit just as much and it's a great way to prepare you for your practice.
This vibrational massage to the frontal lobe has many positive benefits. The frontal lobe is our ‘primary seat of consciousness’.  Through its function we make ethical choices, choosing between ‘right and wrong’, and we suppress unfavourable responses deducing future consequences from current actions. Chronic illnesses such as Alzheimer's and Parkinson’s disease are a degeneration of the frontal lobe.
The vibration that bhramari supplies to this area may be the stimulation we need to keep our brains younger and healthier for longer. 
Please refer to this great youtube clip on how to perform this pranayama.