Historical research involves the systematic collection and evaluation of data from the past to describe and explain events or actions. It aims to reconstruct what happened in the past as accurately as possible without manipulating variables. There are various types of historical sources that can be used, including primary sources from eyewitnesses and secondary sources from non-witnesses. Researchers must critically analyze sources to establish their authenticity, meaning, and credibility by examining factors like authorship, bias, and reliability. The goal of historical research is to learn from history, apply lessons to current problems, understand practices and policies, and test hypotheses about relationships over time.