In the yogic practice and philosophy, Samadhi is a synonym for Enlightenment.
Reaching a state of Samadhi means attaining a state of enlightenment.
This state is attained through a deep meditative absorption or trance, through a state in which individual and universal consciousness unite.
"Steps to Samadhi" represents a process through which one goes towards the state of pure bliss and oneness - the state of Samadhi.