The stages or eight limbs of Yoga – Dharana
It is the sixth stage of Yoga. It implies concentration on a single point or on a task in which the subject is completely engrossed. This is a state of complete absorption for which mind has to be stilled and calmed.
After the practise of Asanas, Pranayama and Pratyahara the subject is in a position to practise Dharana. Asanas temper the body, Pranayama refines the mind and the senses are brought under control by Pratyahara, thus preparing the subject for Dharana.
Concentration is a must to master anything.