Scopus is Elsevier’s abstract and citation database launched in 2004. In 2009, the Content Selection and Advisory Board (CSAB) was formed to develop an objective system of evaluation and validation of peer-reviewed journals for inclusion or exclusion in Scopus against transparent and fair criteria. It covers nearly 36,377 titles (22,794 active titles and 13,583 Inactive titles) from approximately 11,678 publishers, of which 34,346 are peer-reviewed journals in top-level subject fields Life Sciences, Social Sciences, Physical Sciences and Health Sciences. It covers three types of sources: Book Series, Journals, and Trade Journals. All journals covered in the Scopus database, regardless of who they are published under, are reviewed each year to ensure high-quality standards are maintained. Searches in Scopus also incorporate searches of patent databases. It gives four types of quality measure for each title, those are H-Index, Cite Score, SJR (SCImago Journal Rank) and SNIP (Source Normalized Impact per Paper). Anyone can find all titles on the Scimago Journal Ranking website. According to the Scimago Journal Rankings, Nature has the highest H-index (1011 as of 2016), and CA - A Cancer Journal for Clinicians has the highest SJR (39.285 as of 2016). Scimagojr.com used to give country ranking based on Total Published Documents, Citable documents, Citations, Self-Citations, Citations per Document and H index. As per this website USA (H-Index : 1965) is in first place, UK (H-Index : 1213) is in the second place and Germany (H-Index : 1059) is in third place based on national H-Index.