LightScribe was not a format as such, but a technology introduced by Hewlett-Packard in 2004 that allowed optical drives to laser-etch labels onto compatible media.
As well as a compatible LightScribe enabled drive, LightScribe drivers and suitable disc-burning software that supported LightScribe was required. Finally, a LightScribe compatible disc was needed. After burning data to the disc, the disc is turned over so the label side is face down, and the same laser that burnt data is used to etch the reactive dye coating of the disc.
The LightScribe technology could only etch in monochrome, and it was possible for the design to fade over time, especially if the disk was exposed to direct sunlight. Etching a disc took a considerable amount of time; up to 30 minutes for a high-contrast image.
As of 2013, the technology was no longer promoted by Hewlett-Packard, but it is possible to obtain the software from elsewhere. Drive manufactures have now ceased making LightScribe enabled optical drives (optical drives in computers are under threat in general).