The answer to 'why is my ant trails' is that you likely have an ant infestation in your home. Ants leave scent trails using pheromones to mark the path from their nest to food sources, which can result in visible 'trails' of ants marching through your home. Common causes include crumbs, spills, or other food sources that attract ants, as well as cracks or entry points that allow them to get inside.
The symptoms of an ant infestation include seeing ants in your home, following distinct trails or paths, and finding nests or piles of ants. To solve the problem, you'll need to eliminate the food sources and entry points that are attracting the ants, which may require a combination of DIY methods and professional pest control services.