the difference is that Primary evidence is took from that moment and secondary is a piece of evidence found from the past.
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primary data structures
Primary sources of information are great because they are first hand information from someone who was there. Secondary sources are based on primary sources, and may be biased.
Secondary data is collected by someone other than the researcher, such as census information. Primary data is collected first hand, such as interviews.
Meta analysis is a type of secondary research, in which primary research is again analyzed
Secondary data plays a crucial role within assessments in emergencies, specifically in phase I and II when collecting data and information produced from outside the field assessment is necessary to provide a baseline with which to compare primary data. SD complements and benefits the primary data collection