The Web of Science Core Collection includes citation indexes that cover research in journals, books, and proceedings in the sciences, social sciences and art & humanities.
The major article citation indexes are:
- Science Citation Index Expanded
- Social Sciences Citation Index
- Arts & Humanities Citation Index
Journal inclusion in these indexes is quite selective. Clarivate Analytics (the publisher of Web of Science) uses citation analysis, among other criteria, to assess journal importance and impact to choose which journals to include in these indexes.
The Emerging Sources Citation Index is less selective. Journals indexed here must be peer reviewed, follow ethical publishing practices, meet Clarivate's technical requirements, have English records, and be recommended or requested by a scholarly audience of Web of Science users.
There are also conference proceeding and book citation indexes for the sciences and social sciences.