Although it is often an inexpensive source, are sometimes not adequate to meet the needs of the researcher since they were acquired for some purpose other than the research question at hand.

External secondary data

Explanation:

External security data is the data that is gathered and stored by employees , organization or any other person outside the organizational area.This data and information is collected through from other organization.

According to the question, external secondary data does not always fulfill the requirement of research as the collected data is not meeting the expectations of the research because it might have been gathered for some other reason as primary data.