Scopus is a major database for literature searching in Science, Medicine and some Social Science subjects.
With a significantly broader reach than PubMed, it covers over 21,000 journals from more than 5,000 publishers worldwide, plus 6.5 million conference papers from over 17,000 events. It includes content from a number of other major databases including: Medline (medicine) 1966- , Embase (medicine) 1970- , Compendex (engineering) 1970- and Geobase (geography) 1980- .
Scopus has a range of tools for measuring impact using citation data (i.e. the number of times papers, authors and journals are cited). You can use it to find the most highly cited articles and authors in your field and to calculate the h-index for individual researchers. Scopus was used to provide citation data to the REF 2014.
In addition, it is easy to use Scopus to broaden your reading because it allows you to search for items which have cited a key paper, book or author in your field. Searching in this way can help you to find items which you have not found via traditional keyword searching. Citation indexing can also help you to track the history of a research idea.