What is Firefly?

Firefly is a term that can refer to various technologies depending on the context. It is often associated with visual effects rendering in computer graphics, where 'fireflies' are bright, unwanted pixels that appear in rendered images due to sampling errors or other issues with the rendering algorithm. These can occur in ray tracing or path tracing algorithms. The name also has been used for video games, science fiction settings and other purposes. Without more context, its use is difficult to pinpoint.