Note: The "new" version of Web of Science does not yet have full functionality. See this FAQ for how to switch to the "old" Web of Science interface.
Use this link to access Web of Science.
Web of Science is a database published by Clarivate Analytics.
The Web of Science Core Collection includes:
You can also use the "Select a Database" drop-down menu to search other databases within the Web of Science interface, including:
You can create a Web of Science account to save your search results by clicking "Sign In" in the top right corner of the screen.
You can access Journal Citation Reports to look up journal impact factors with the link near the top left of the screen.