Some terms used in Scopus explained (taken from Scopus.com):
SJR (SCImargo Journal Rank) is weighted by the prestige of a journal. Subject field, quality, and reputation of the journal have a direct effect on the value of a citation.
SNIP (Source Normalized Impact per Paper) measures a source’s contextual citation impact by weighting citations based on the total number of citations in a subject field. SNIP is the ratio of a source's average citation count per paper and the citation potential of its subject field.
IPP (Impact per Publication) measures the ratio of citations in a year (Y) to scholarly papers published in the three previous years (Y-1, Y-2, Y-3) divided by the number of scholarly papers published in those same years.
To compare journals based on citation metrics in Scopus, click on the Compare journals link above the search box. You can compare up to 10 journals at the same time.
CiteScore Metrics is Elsevier's metrics for measure journal impact.
CiteScore makes use of a three-year citation window instead of two (used by Web of Science's Journal Citation Report). For more details of how CiteScore is calculated and explanation of the other indicators in the metrics, read this post by Elsevier.
SCImago Journal Ranking is a freely available portal for ranking journals based on information in the Scopus database. You can also obtain Country Ranking information at the portal. To access SCImago Journal Ranking, click here.