Web of Science is a multidisciplinary search engine and also a citation database for scientifc and scholarly literature in all areas of study. For many articles WoS contains the references given by the authors, as well as the citations of that particular article by other authors. That way you can easily find related articles and you can also find information about the impact an article has (made).
In this LibGuide you can find information and useful tips on Web of Science.
Libguide Web of Science