A CDG file is a specialized graphics format used primarily for karaoke performances. The acronym CD+G stands for Compact Disc plus Graphics, which originated from the technology used to store graphical data in the sub-channel bits of a standard audio CD. Unlike traditional video formats, a CDG file does not contain any audio data; instead, it contains low-resolution raster graphics and instructions used to display lyrics and simple animations that synchronize with a separate audio track. The graphics are typically limited to a 16-color palette and a resolution of 300x216 pixels. In modern digital use, CDG files are almost always paired with a corresponding MP3 file of the same name (forming an MP3+G pair). When a karaoke player opens the MP3, it simultaneously reads the CDG file to render the lyrics on the screen in real-time, changing colors to guide the singer. Because of its extremely small file size and simplicity, it remains the industry standard for digital karaoke systems worldwide.