Yom Kippur is a solemn and holy day in the Jewish faith observed annually in the United States. It is known as the Day of Atonement and is considered the most important day of the Jewish calendar. The holiday typically falls in late September or early October and is observed with fasting, prayer, and repentance. Many Jews refrain from work and other activities on this day and spend time in synagogue, reflecting on their actions and seeking forgiveness for any wrongdoings. Yom Kippur is recognized as a public holiday in some areas, and schools and businesses may be closed.