The answer to 'spider trails' is that spider trails are typically caused by the presence of spiders in your home. These trails are made up of the silk strands that spiders use to move around and construct their webs. Spider trails are often found in corners, along baseboards, and in other areas where spiders are active. Seeing these trails is usually a sign that you have a spider problem that should be addressed.
In most cases, spider trails can be addressed through DIY pest control methods. This may include sealing up cracks and crevices where spiders are entering, removing webs and egg sacs, and using insecticide sprays or baits to eliminate the spider population. However, if the spider problem is severe or you are unable to effectively get rid of the spiders on your own, it's best to call in a professional pest control technician who can properly identify the spider species and implement a more comprehensive treatment plan.