Rosh Hashanah is the Jewish New Year festival. It lasts two days.
Rosh Hashanah commemorates the creation of the world. It is also a judgement day, when Jews believe that God balances a person's good deeds over the last year against their bad deeds, and decides what the next year will be like for them.
It's a time for people to think about their priorities in life and to reflect on what has been achieved in the past year.
It's a time of asking for forgiveness for wrongdoings (sins).
A lot of time is spent in the synagogue during Rosh Hashanah.
One of the synagogue rituals for Rosh Hashanah is the blowing of the Shofar, a ram's horn trumpet. A hundred notes are sounded in a special rhythm.
The sound of the shofar starts a ten-day period known as the 'Days of Awe', which ends with the solemn festival of Yom Kippur.