Yom Kippur Katan is not a rabbinic institution in the strict sense but rather a custom that developed among the Kabbalists of Safed in the 16th century. Led by great sages like Rabbi Isaac Luria (the Ari z"l), these mystics taught that every month, the moon "diminishes" itself in a cosmic cycle of exile and renewal. On the day before the new moon, the soul of a person should likewise "diminish" itself through fasting and repentance.
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During times of need (such as the COVID-19 pandemic), major publishers like Artscroll have shared verified, authoritative, and complete PDFs of the Yom Kippur Katan service. Yom Kippur Katan is not a rabbinic institution
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