This suggests the difficulties of finding useful information in this huge, unorganized mass of material. There are two different ways to look for useful Websites. One way to is rely on directories , and the other is to use search engines .
Directories are lists of Internet sites arranged by subject.
They are created by people who review the sites, decide if they are worth linking to, and choose which subjects to list them under. Directories are selective in what they list, which means that they offer fewer sites to choose from than search engines do. Some directories have a rating or ranking system that is explained at their site. Directories are easy to use because you can browse through the categories. Though this can be tedious, it solves some of the search vocabulary problems discussed in OWL 4 .