Citation count
How many later publications cite a given work, according to whichever index you ask.
Citation counts differ by source because coverage differs: Google Scholar counts theses, preprints, and books and inflates accordingly; Scopus and Web of Science count a curated set and report lower numbers. Neither is wrong — they answer different questions.
A count measures attention, not correctness. Retracted papers accumulate citations, review articles attract more than primary research, and a methods paper can be cited thousands of times by people who never read past the abstract. Highly cited work is worth knowing about; that is different from being right.
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See also
Impact factorA journal-level metric: the average number of citations in one year to articles the journal published in the two preceding years.h-indexA researcher-level metric: the largest number h such that they have h publications each cited at least h times.Citation indexA database that records which publications cite which, allowing you to trace a literature forwards in time.RetractionA journal's formal withdrawal of a published paper because its findings are unreliable, usually through error or misconduct.