What is it?
Scopus sources allows you to browse a list of all journals, book series, trade publications, and conference proceedings available on Scopus or are accessed from other external web sites by using Scopus.
What´s it used for?
Use it to find a source and view it´s associated metrics. Use qualitative as well as quantitative metrics when presenting your research impact.
CiteScore, SNIP & SJR
These are different measures for evaluating the impact of a journal.