The Web of Science is an evolving record of the dynamic world of scholarly communication with new source content continually added, including citations. JCR, on the other hand, is an annual report on the citation impact of a defined set of journals at a given moment in time.
Entries into databases:
Research with confidence: Explore the Web of Science Core Collection database
You need reliable building blocks to confidently advance scholarly research. Our independent and thorough editorial selection process coupled with sixty years of consistent, accurate, and complete indexing enables efficient research discovery in an environment you can trust.
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Uncover new connections between ideas and detect emerging fields as you search journal, conference, and book content across 250+ research areas--all seamlessly connected via citations.
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Safeguard research integrity with a publisher-neutral, curated resource trusted by more researchers worldwide than any other citation database.
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More information:
https://clarivate.libguides.com/webofscienceplatform
Journal Citaton Reports (JCR)
Journal Citation Reports (JCR) is a database containing statistics and quantitative tools for systematic and objective evaluation, categorization and comparison of more than 12.000 peer-reviewed scientific and professional journals. One of the tools for such comparison is the so-called "impact factor", which gives the rate of frequency of citations of an average article of a given journal for a given period of time and can be used as a basis for estimating the prestige of academic journals.
JCR serves primarily the needs of information specialists, publishers and editors, but is also used by authors (for example, to select journals to publish and to identify journals relevant to their area of research).