Ovulation is the single event of an egg being released from the ovary, while fertile days (the fertile window) are the several days before and on the day of ovulation when intercourse can lead to pregnancy, because sperm can survive for days waiting for the egg, which only lives for about 12-24 hours. The key difference is ovulation is a moment, but the fertile window is a period of about 6 days (5 days before + day of ovulation), with the most fertile days being the 3 days leading up to and including ovulation.
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