They're both what, rather than who. Yom Kippur is the Day of Atonement, when observant Jews fast and believe that, if they've made sincere efforts to put right any wrongs committed over the previous year, G-d forgives those wrongs. Yom Kippur comes tens days after Rosh Hashanah, which marks the beginning of a new year on the Hebrew calendar.
No. Between Rosh Hashanah and Yom Kippur are the "10 Days of Awe". It's a period of reflection.
Rosh Hashanah and Yom Kippur.
Shabbat and Yom Kippur are the two holiest holidays.
Rosh Hashanah is the Jewish new year and Yom Kippur is the day of atonement.
Rosh Hashanah and Yom Kippur.
High Holidays
Rosh Hashanah, Yom Kippur
Rosh Hashanah and Yom Kippur.
Some of them do.
Rosh Hashanah and Yom Kippur.
Judaism
Rosh Hashanah and Yom Kippur