Science Tracers Bullet Online is an informal guide to help people locate published materials on subjects in the field of science and technology about which they only have a general knowledge. SCTB includes lists of bibliographies, conference proceedings, technical reports, and journal listings, among others. Users may search by keyword or title. The results of the search usually contain a definition of the field related to the query, bibliographies, and links to other sections in the database of Library of Congress Subject Headings that are related to the query.