Primary sources refer to original and raw data that is in its original form and has not been modified in any way. However, there are various synonyms for the term primary source such as first-hand account, original document, and authentic source. A first-hand account can be defined as a narrative or a report that is directly related to an experienced event. An original document refers to any material that has been created during the course of an event, such as archives, letters, and photographs. An authentic source is reliable and trustworthy in delivering accurate information about a particular event. Overall, the synonyms of primary sources emphasize the originality and untouched information that can be extracted from these sources.