2. Singles are usually released in multiple formats at the same time, such as digital download, CD and film. A digital single is simply a single released on the Internet.
3. Digital singles are the same.
4. Expanding knowledge: A single is a form of pop songs or music distribution, which is generally published to promote the released or upcoming music albums. In the field of music, a single refers to these relatively short recordings that contain a song or more clips. Traditionally, singles have been released through records, CDs and other forms. Most of them only have a side, contain a song and are named after it. Some have B-sides, including other versions of this song, or other songs of the same singer/band. There are also a few that contain two main songs, called double A-side. A song played on a radio station or downloaded from the Internet is sometimes called a single.