Shofar Ceremony

The central observance of Rosh Hashanah is the sounding of the shofar,  the ram’s horn, on both days of the holiday (except if the first day is Shabbat, in which case we blow the shofar only on the second day). 
 

The blowing of the shofar represents the trumpet blast that is sounded at a king’s coronation. Its plaintive cry also serves as a call to repentance. The shofar itself recalls the Binding of Isaac, an event that occurred on Rosh Hashanah in which a ram took Isaac’s place as an offering to G‑d. 
 

It is  also preparing us to the the time when G‑d himself will blow in a great shofar in the time of the redemption by the coming of Mashiach speedily in our days.