Google Scholar Citations provide a simple way for authors to keep track of citations to their articles. You can check who is citing your publications, graph citations over time, and compute several citation metrics. You can also make your profile public, so that it may appear in Google Scholar results when people search for your name. -- from Google Scholar
Web of Science allows you to look both forwards and backwards in time when tracking citations. What does the mean? It means that once you locate an article, not only can you look at what that article cited, but also find more recent articles that have cited the one you are looking at; hence the WEB of science! Web of Science is a great citation management tool and even allows you to to create citation reports, maps and alerts when new authors have been published. Check out the Web of Science video tutorials below to take advantage of the power of Web of Science and its citation management tools.