Nowadays, the vast majority of TV shows and movies feature subtitles, textual transcriptions of the dialog displayed in the lower side of the screen.
Subtitles can be either the actual transcription of the dialog, or, more frequently, they are translated versions.
Software tools which create subtitles enable users to translate existing subtitles or to make custom ones for the movies they want to watch.
Furthermore, users will have the possibility to synchronize the text with the appropriate video frame.