What's the difference between primary source and secondary source

A primary source is a source made during the time of the event and is a first hand experience while a secondary is a source that has been written based on info learnt through others.

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A primary source is a document or physical object which was written or created during the time under study. These sources were present during an experience or time period and offer an inside view of a particular event. Some types of primary sources include:

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