The answer to 'what is silverfish' is that silverfish are small, wingless insects that are common household pests. They are typically gray or silver in color, with a long, slender body and three long appendages at the rear of their body. Silverfish get their name from their distinctive fish-like movements and shiny, metallic appearance.
Silverfish are nocturnal and prefer damp, humid environments. They feed on carbohydrates, starches, and sugars, and can often be found in areas with high moisture levels such as bathrooms, kitchens, and basements. While they do not bite or sting, silverfish can cause damage to paper products, fabrics, and other household items.