The holiday of Rosh Hashanah begins on the first day of the Jewish year. The Torah refers to this holiday as the Day of Judgment, a day of repentance, and a day of the Shofar. Although there are many nuances and meanings to this holiday, it is primarily a day that celebrates the beginnings of a new year.
The two days of Rosh Hashanah are spent almost entirely in prayer at the synagogue. However, Rosh Hashanah is also a holiday filled with celebration and festivity. We eat festive holiday meals and raise our glasses in joy. We express our confidence in G-d that He will indeed forgive us and grant us a healthy and successful year.