The document outlines the various layers of the web, including the surface web, deep web, dark web, and marinas web. The surface web represents only 10% of online information and is publicly accessible, while the deep web, accounting for about 90%, consists of unindexed content like databases. The dark web, a subset of the deep web, requires specific software to access and is associated with illegal activities, whereas the marinas web is described as even more dangerous, requiring specially coded access.