They claim to have over 5,000,000 articles indexed. Updated each business day, the site organizes the articles is twelve main categories. The articles are briefly described, and links are provided to the full text and the main site of the periodical. The database can be searched by keyword and by one of the nine subject categories. Search returns include article title, periodical, and short description, with a link to the full-text.
Visitors can also view a list of the publications indexed.
These are specialized collections of data, mostly catering for researchers. Access to these databases can be restricted to certain users. This is realized by means of passwords. This procedure is increasingly being used on the Internet, especially for access to electronic journals. Invisible Web Certainly hidden from the view of search robots but all too often also from that of subject directories , is the information stored in the many thousands of databases to be found on the Web.