What is the difference between primary data and secondary data?

Answer 1

primary data is data which has been collected by yourself, which is more reliable and up to date. secondary data has been collected from a secondary source (Other people, business etc.) so it may not be valid or up to date

Answer 2

Primary is the use of immediate data so collected information done by you through use of surveys, interviews and/or focus groups. While secondary data is obtained from some where else like the internet.