The morning service ("Shacharit") consists of the following: the morning prayers, the Shema, the Amidah, the reading of the Torah, the Yizkor service, the Musaf service, the priestly blessing.
The reading of the Torah is about the solemn service in the Holy Temple on the Day of Atonement, conducted by the High Priest himself. This was the only day of the year on which the High Priest was allowed to enter the Holy of Holies to offer incense and pray on behalf of the Jewish people.
The Yizkor service is recited by those who have lost either one or both of their parents. Others leave the synagogue until the completion of the Yizkor service; the reason for this is to advocate long life for the living parents.
The Yizkor is more than a service of remembrance, but rather it is a time for the relatives of the departed to connect with the souls of their loved ones on a deeper level; tradition has it that during the Yizkor service, the souls of the departed descend from heaven and are joined with those who are close to them.