ENSO - A review

El Nino events are large climate disturbances which are originated within the equatorial Pacific, and occur in every 2 to eight years. The developed phase of El Nino is characterized by unusual warm waters at the ocean surface, from the coasts of Peru and Ecuador to the middle of the equatorial Pacific. This phenomenon is caused by strange weakening of the trade winds blowing westward, which allows warm surface waters to reverse their direction eastward. The climatic impacts of El Nino are amplifying throughout the planet which may show several effects on regional weather. it's related with wide-ranging changes within the climate system and may cause prominent socio-economic impacts affecting infrastructure, agriculture, health and energy sectors. albeit El Nino appears within the region of tropical Pacific; it's impact on the worldwide climate and weather phenomena like drought/flooding and tropical storms. the traditional status within the equatorial Pacific is modified due to the raise in greenhouse gases which in turn leads to El Nino Southern Oscillation (ENSO) changes. we are able to assure that ENSO variations will endure and influence the worldwide climate within the coming decades and centuries. Hence, forecasting and interpreting ENSO conditions are essential to both the scientists and therefore the public. during this paper, the occurrence of El Nino and its impact on global climate and socio-economic status has been studied and reviewed from literature.