Visual snow is a neurological condition characterized by the persistent panfield perception of tiny flickering dots that resemble static, or snow. Visual snow syndrome, where the static is accompanied by intrusive symptoms such as photophobia and palinopsia, is strongly linked to migraine and aura both from a clinical and pathophysiological perspective. It is often associated with tinnitus, which some consider the auditory correlate of visual snow, and psychiatric disturbances. These features, as well as the lack of effective pharmacological treatments, can make patient management extremely challenging. The mysteries underlying this sensory phenomenon have only begun to unravel, thanks to a growing body of literature from recent years. Neuroimaging, electrophysiological and neuro-behavioral evidence points to visual snow syndrome as a complex disturbance of sensory processing, which involves—but is not limited to—visual brain areas. This chapter offers a comprehensive overview of the current knowledge concerning visual snow syndrome.