Self realization is exactly what is meant by these two words: the realization of the self.
Before self realization, the human being is divided in two entities.
On one side there is the worldly perception of human existence. On the other side, there is the invisible, energies, life force.
Self realization means uniting the spirit with the personality.
When this unification takes place, life suddenly takes a new dimension.
The perceptions are shifted and individuals can see themselves in the vaster context of larger human and planetary evolution.