"Broad Spectrum" refers to a type of product or treatment that is effective against a wide range of targets. In the context of sunscreens, for example, broad spectrum means that the product protects the skin from both UVA and UVB rays, which can cause skin damage and increase the risk of skin cancer. In the realm of antibiotics, broad spectrum antibiotics are effective against a variety of bacteria, rather than just a specific type. This makes them useful in treating infections when the exact bacteria causing the illness is unknown, allowing for a more comprehensive approach to patient care.