SDTV, or Standard Definition Television, refers to a television format that has a lower resolution compared to modern high-definition formats. Typically, SDTV has a resolution of 480i or 576i, which means it displays images with fewer pixels, resulting in less detail and clarity. This format was widely used before the transition to high-definition broadcasting. With the rise of HDTV and 4K technology, SDTV has become less common, but it is still used in some areas, especially for older television sets and certain broadcasts. Many classic shows and movies were originally produced in this format, making them accessible to viewers who prefer or only have SDTV equipment.