Shuddhikriyas are different cleansing processes. Shuddhikriyas are not meant to be practiced daily. They are used when cleansing processes are needed. Agnisar Dhauti, Vamandhauti, Kapalbhati, Jalaneti, Nasagra Drishti and Trataka are all types of shuddhikriyas.
Kapalbhati : The process of kapalbhati is related to the breathing process, however it is not a type of pranayam. But, certain sadhakas think in this manner and study kapalbhati under the impression that they are studying a type of pranayam. However, process of cleaning the wind pipe is one of the shuddhikriyas. The word kapalbhati is made up of two words, kapal meaning skull ( here skull includes all the organs under the skull too ) and bhati means shining, illuminating. Due to the process, the organs under the skull mainly the brain and the small brain are influenced in a good manner. Hence the word is used in that way.
Agnisar Dhauti : Dhauti is a word made up of Sanskrit verb ‘Dhau’ which means to wash. The process of such cleaning is Dhauti Kriya. However, even if this kriya is termed as Dhauti kriya, there is no actual process of washing involved. In this process, swift movements of the stomach are expected. The word Agni used here refers to the fire in the form of internal digestive juices.
Vaman Dhauti :It is another easy method of dhauti. The washing up of the entire track starting from the mouth to the digestive path at the beginning of the small intestines, that is mouth, esophagus, stomach etc are included in this process. One can wash one's mouth, but in the daily routine one cannot wash the esophagus or the stomach. The impurities residing there are carried along with the food particles and are mixed in some proportion with the blood. Jalaneti : Out of the six shuddhikriyas, the shuddikriya for the cleaning of the nasal path is known as neti. The aim of the process is to purify the breathing path right from the nostrils to the throat. If the aim is achieved using water, the process is known as Jalneti.
Trataka : There is a shuddhikriya known as Trataka. It is useful for purification of the mind. Concentrating your eyesight on a bindu (point) without fluttering the eyelids till the eyes water is known as Trataka. Nasagra Drishti : Nasagra Drishti is a process of purifying the mind. Sitting cross-legged or in the Padmasan position, the person fixes the gaze on the tip of the nose.