Article Metrics,
also citation tracking, can be used to determine if an article, book, journal, or particular author has been cited by another work.
Author Metrics,
measure the impact and productivity of a researcher.
Journal Metrics,
can help track citation patterns within journals and determine which journals are highly-cited.
Institution Metrics,
measure an institution's overall impact based on the publications of its authors and the number of times they have been cited.
Altmetrics,
help researchers measure their impact from papers, data sets, websites, blog posts, and more.