The Nebula Awards annually recognize the best works of science fiction or fantasy published in the United States. The awards are organized and awarded by the Science Fiction and Fantasy Writers Association (SFWA), a nonprofit association of professional science fiction and fantasy writers. They were first given in 1966 at a ceremony created for the awards, and are given in four categories for different lengths of literary works. A fifth category for film and television episode scripts was given 1974–78 and 2000–09, and a sixth category for game writing was begun in 2018. In 2019 SFWA announced that two awards that were previously run under the same rules but not considered Nebula awards—the Andre Norton Award for Middle Grade and Young Adult Fiction and the Ray Bradbury Award for Outstanding Dramatic Presentation—were to be considered official Nebula awards. The rules governing the Nebula Awards have changed several times during the awards' history, most recently in 2010. The SFWA Nebula Conference, at which the awards are announced and presented, is held each spring in the United States. Locations vary from year to year. The Nebula Awards are one of the best known and most prestigious science fiction and fantasy awards and together with the Hugo Awards have been called "the most important of the American science fiction awards". Winning works have been published in special collections, and winners and nominees are often noted as such on the books' covers. SFWA identifies the awards by the year of publication, that is, the year prior to the year in which the award is given. For lists of winners and nominees for each Nebula category, see the list of categories below. Source: Wikipedia (en)