what is gmar chatima tova

"Gmar Chatima Tova" is a traditional Hebrew greeting said before and on Yom Kippur, the holiest day of the Jewish year and the culmination of the High Holidays. It is a customary greeting among Jews on Yom Kippur and the period between Yom Kippur and Rosh Hashanah. The phrase means "a good final sealing" in Hebrew. It is often abbreviated as "gmar tov". The word "chatima" means "sealing," and "tova" means "good". The phrase is used to wish someone a good final sealing in the Book of Life, which is a metaphorical book that is said to be opened on Rosh Hashanah and closed on Yom Kippur.