Seamless gutters are gutters that are made from one continuous piece of material, without any seams or joints. They are custom cut on-site by professional installers to fit the exact dimensions of a building. Seamless gutters have many advantages over regular gutters, such as being more leak-resistant, durable, low-maintenance, and aesthetically pleasing. However, they also cost more than regular gutters and require professional installation. Seamless gutters can be made from various materials, such as aluminum, steel, or copper.