The term "broad spectrum" refers to a wide range or variety of something. In general usage, it can be used to describe an action, event, or phenomenon that affects or impacts a broad group or category of people, things, or ideas. It is often used in scientific and technical contexts to refer to the ability of a substance, device, or method to work effectively across a wide range of conditions, applications, or environments. In other words, something with a broad spectrum has a wide reach or impact, and can be effective over an extended period or in various situations.