1) Aninut, The first, most intense period of mourning is the period between the death and the burial. It is the most intense period of mourning because the grieving which is the first degree relatives has to follow the Torah law by doing mitzvot requiring action (praying, laying tefillin, etc.). It is during this period that the k'riah is preformed as a sign of grief.
2) Shivah, The Shivah begins after the burial, and extends to the morning of the seventh day. The distinguishing feature of the Shivah is that the mourners take an almost complete break from the procedures and involvements of everyday life to focus exclusively on the memory of the departed. At this point the mourners with receive consolation from their extended family, friends,