Moksha is the release from 'Samsara' (the cycle of rebirth) and the end of all suffering by realizing one's true divine nature.
The Gita describes Moksha as the highest state attained by those who have transcended the three 'Gunas' (modes of nature) and 'Ego'.
Freedom from the 'rollercoaster' of happiness and sadness based on external events.
Mental freedom and total inner peace, where one is no longer a slave to their desires or fears.
Remaining calm and content even when facing a significant setback, knowing that the inner self is untouched.