What are the sources of big data in the medical and health field?

Definition and source of health big data: Big data is the inevitable product of the development of social informatization. There are different opinions on its specific definition and there is no unified answer. In The Age of Big Data, big data refers to the analysis and processing of all data, not sampling [1]. Gartner's definition of big data: also known as massive data, refers to massive, high-growth and diversified information assets, which need new processing modes to have stronger decision-making, insight and process optimization capabilities. The author agrees with Internet Weekly that "big data" is far more than a large amount of data and corresponding processing technologies, or the so-called "4V" simple concept, but contains things that people can do on the basis of big data, which cannot be realized on the basis of small-scale data. Big data allows us to analyze massive data in an unprecedented way, gain valuable products and services or profound insights, and finally form the power of change.