Journal Citation Reports - InCites provides journal impact factors and rankings across various disciplines. It collects citation data and calculates metrics like impact factor, immediacy index, and half-life for journals indexed in Web of Science. Impact factor is a measure of how frequently the average article in a journal is cited in a given year. It is calculated by dividing the number of times articles published in the last two years were cited by the total number of articles published in those two years. The document provides instructions on how to access Journal Citation Reports through the library database to search for journals, compare metrics between journals, and view trends in journal-level indicators over time.