What is big data exactly?

Big data is the generic term for big data sets, big data technologies, and big data applications that provide services for decision-making issues.

The big data set refers to all the possible data used in a decision-making problem, typically with large data volumes, multiple sources, diverse types, and value (4V features)

Big Data technology refers to the acquisition of big data resources, storage management, mining analysis, visual presentation (visualization, reporting, monitoring) and other technologies

Big Data application is a new decision-making method that uses big data sets and big data technology to support decision-making activities.

What is big data exactly?