Scopus is an abstract and citation database of peer-reviewed literature run by elsevier.
Scopus is described by elsevier as follows;
Scopus, [is] the largest abstract and citation database of peer-reviewed literature, features smart tools to track, analyze and visualize research. Scopus delivers an overview of the world's research output in the fields of science, technology, medicine, social sciences and arts and humanities. As research becomes increasingly global, interdisciplinary and collaborative, you can make sure that critical research from around the world is not missed.