A more thorough explanation:

Definition: A historian is an officer who is responsible for creating or contributing to an organization's official history.

For example, in parliamentary law, a historian may be appointed to compile the history of a particular organization, such as a club or society. The historian may gather information about the organization's founding, key events, and notable members, and then present this information in a written or oral format.

Another example of a historian is someone who studies and writes about past events, people, and societies. These historians may work in academic settings, museums, or other cultural institutions. They use primary sources, such as letters, diaries, and government records, to piece together a narrative of the past.

Overall, historians play an important role in preserving and sharing the stories of the past, whether it be for a specific organization or for society as a whole.