History is fundamentally about building accounts of issues or events that have occurred in the past. Historians depend on different types of evidences to build hypotheses and theories of early events in human history. What makes history unique is that it attempts to rebuild accounts of events that are no longer observable. Therefore, historians depend on physical monuments built by past nations or peoples and written and recorded stories, many of which often can be conflicting or incomplete.
Developing accurate accounts of past events requires extensive research and the continuous analysis of new evidences that may arise. Therefore, it has become necessary for the field to rely on other fields for developing evidences, such as genetics to analyze DNA evidences and archaeology to uncover hidden or previously long-lost artifacts.
Historical accounts are almost never linear, and therefore, can differ depending on one's own perspective. To further complicate the field, the common phrase 'history is written by the powerful' stands exceptionally true. For instance, details of ancient wars are written by the victorious party, hence, is likely to be biased and may not reflect fully accurate events. As a result, historians must question the validity and reliability of evidence discovered, and attempt to understand the context surrounding the development of such evidence in the first place. Building an account based on a single piece of evidence would therefore, be hugely erroronous and inadmissible as an accurate historical account.