Web of Science is the oldest, and most used citation database in the world. Managed by Clarivate Analytics, it is a multi-disciplinary repository of research output from global sources. It specializes in collecting abstracts and citations for Social Sciences and Hard Sciences research output, but maintains moderate coverage of the Arts & Humanities. It indexes from 10,000 of the most cited, peer-reviewed journals starting from around the year 1900, with citations starting in 1997.
There are a number of different levels of metrics available in WoS. The quickest way to see these is to scroll to the right hand of the screen and view the "metrics" tab in the author or journal profile in WoS. This will display all metrics available with the Purdue subscription.
