Final answer:
Primary sources come directly from the person or thing being researched, secondary sources interpret primary sources, and tertiary sources summarize primary and/or secondary sources.
Step-by-step explanation:
Primary, Secondary, and Tertiary Sources
In research, there are three types of sources: primary, secondary, and tertiary. Primary sources are original materials that come directly from the time period being studied, such as diaries, letters, or photographs. Secondary sources are created after the fact, such as books or articles that analyze and interpret primary sources. Tertiary sources are summaries of primary and/or secondary sources, like encyclopedias or textbooks.
Examples:
- Primary source: A diary written by a soldier during World War I.
- Secondary source: A book that analyzes the impact of World War I on society.
- Tertiary source: An encyclopedia entry that provides a summary of World War I.