Demographic data includes statistics like age and income that are used to identify target markets. Producers use demographics to understand the viewing habits of potential audiences and shape their films accordingly. The document discusses using the UK's social class system of 6 levels (A to E) to determine which groups would be most interested in a thriller film. While level E includes students and young people most likely to enjoy thrillers, it also includes pensioners who may not. Therefore, the document recommends also targeting groups A and B as they will be more able to financially support the film.