Diaphragmatic breathing
Diaphragmatic breathing, abdominal breathing, belly breathing, or deep breathing, is breathing that is done by contracting the diaphragm, a muscle located horizontally between the thoracic cavity and abdominal cavity. Air enters the lungs as the diaphragm strongly contracts, but unlike during traditional relaxed breathing (eupnea) the intercostal muscles of the chest do minimal work in this process. The belly also expands during this type of breathing to make room for the contraction of the diaphragm. See also 
Breath
Buteyko method
Circular breathing
Kussmaul breathing
Pranayama – a traditional Yogic practice of slowing and extending the breaths, used during meditation
Shallow breathing – a type of breathing that is mutually exclusive to diaphragmatic breathing and is associated with multiple anxiety disorders
Wim Hof method
Complete breathing

References

Respiration