Dhyana Vigyan or Dhyana Yoga

Dhyana is the 7th limb of yoga, building upon asana (physical posture), pranayama (breath control), pratyahara (control of the senses, moving the focus to the inside), and dharana (concentration). The word dhyana comes from the Sanskrit word dhyai, which means “to think of.”
Dhyana involves concentration and meditation on a point of focus with the intention of knowing the truth about it. This deeper concentration of the mind is the instrument of self-knowledge where one can separate illusion from reality, and eventually, reach the ultimate goal of yoga: samadhi (bliss, or union with the source)