Trail systems are networks of paths designed for outdoor activities such as hiking, biking, and horseback riding. These trails can vary in difficulty and length, catering to different skill levels and preferences. They often connect various natural features, parks, and recreational areas, providing access to scenic views and wildlife. Many trail systems are maintained by local or national organizations, ensuring they are safe and accessible for users. Popular examples include the Appalachian Trail and the Pacific Crest Trail, which attract outdoor enthusiasts from around the world. These systems promote physical activity and encourage appreciation for nature.