With the help of self-realization, when a Yogi stops taking ownership of the action done by body, sense and mind and starts believing in the omnipresent God as the cause of every action and reaction; it is called Jnana Yoga. It is called Karma Sanyasa Yoga as well according to Bhagwad Gita.
In this Yoga, the Yogi remains at bliss by doing self-observation and contemplation. Even though Jnana Yoga and Karma Yoga use different tools and methods of Sadhana, ultimately both reach the same state of realization required to attain eternal bliss.
In this process, the negative ego caused by darkness of ignorance is destroyed by the light of knowledge and wisdom. Ignorance ignites desire and greed that leads to karma bondage. Practice of Jnana Yoga removes ignorance, and ultimately liberates the yogi from karmic bondage. Complete liberation from karmic bondage is possible by Gyan Yogi.