A scientific periodical directed at experts, scholars, and researchers is known as an academic journal. Articles are often produced by subject matter specialists and contain more technical terminology. They include unique research, data-driven conclusions, footnotes or endnotes, and, more often than not, an abstract and bibliography. A magazine that covers topics within a specific field and is intended for an audience in addition to scholars is called a professional journal. These publications tend to have less formal writing and can be more subjective. A book that has both scholarly articles and popular content aimed at a general audience is called a hybrid book. The word "journal" comes from the French word journalie which means daily record. In modern usage, a journal is any regularly issued publication such as a newspaper or magazine. However, in the past it could also be a collection of writings by a single author or group of authors. Today, this is called an anthology or compilation. Books, on the other hand, can only be written by one author or editor. This means that each volume contains only one set of stories or ideas. Books can be further divided into original works (no copies available elsewhere) and reprint works (copies available from other publishers). Reprint works may be updated with new material or corrected errors found in the original version. Some originals are so important that they are still referred to by their old title even though there's a reprint available.