A Snapchat ad filter is a customizable graphic overlay that can be applied to photos and videos on the popular social media app, Snapchat. These filters are designed to enhance and personalize content, while also serving as a promotional tool for businesses and brands. With a variety of options to choose from, including geotags, branded filters, and sponsored lenses, Snapchat ad filters allow users to add a touch of creativity and fun to their snaps, while also providing companies with a unique and effective way to reach their target audience.