An effects filter is a digital photo editing tool that changes the overall look of a photo with a single click. It applies a predefined set of adjustments to color, contrast, brightness, and other properties to the image. These adjustments can mimic the look of old film stock, give the photo a certain mood—for example, using sepia toning—or stylize it into a black-and-white version. Filters function as “presets,” allowing you to achieve complex visual effects without having to manually adjust individual parameters.