Data journalism is a term that is used to refer to the increased role that numerical data has in journalism. It brings together computing, technology, statistics and journalism. It is a relatively new term and has become more important as technology and computing has grown. It was just part of investigative journalism before.
The extent to which data journalism is applied is cultural. But it is not just impacted by what is written but how data and statistics are gathered in the first place. This is what this article explains.