2.1 Second-hand:
Created later by someone who didn't have first-hand experience. Secondary sources describe, discuss, interpret, comment upon, analyse, evaluate, summarize, and process primary sources.
2.2 Not original:
A secondary source is one that gives information about a primary source. Secondary sources involve generalization, analysis, synthesis, interpretation or evaluation of the original information.
2.3 After the event:
Written or produced after the event has passed with the benefit of hindsight.
Examples:
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Books - textbooks and monographs which provide broad, foundational coverage of a topic, usually with an in-depth analysis.
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Scholarly Articles – are articles written and reviewed by experts in the discipline after the event or research has been undertaken.
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Newspapers -news reports of something that has already happened. Available in print and online and one of the first mediums to report on an event after social media.