Secondary data refers to data that is collected from other sources rather than directly by the researcher. There are many types of secondary data sources including:
1) Research reports produced by foundations and business associations that can provide industry-specific information.
2) Academic research published in journals or from conferences conducted by universities and research centers.
3) Historical sources found in libraries, archives, and museums that can provide context if the research has a historical component.
4) Official documents, statistics, and publications from organizations that contain financial information, organizational structures, and other details.