The phrase "broad field" refers to a subject or area that covers a wide range of topics or activities. It indicates that there are many different aspects or subcategories within that field. Full definition
In his later years, this interest was more important for the artist, who began to paint in smaller strokes, building the decorative surface of the canvas with broad fields of color. (widewalls.ch)
The field of animal behavior is a very specific niche in the much broader field of veterinary sciences. (veterinarymedicinecareers.org)
The finance industry is a very broad field as there are different businesses that need the services of finance professionals. (template.net)