The fifth limb of ashtanga yoga, the eightfold path of yoga, is Pratyahara प्रत्याहार. Maharishi Patanjali has complied two sutras for pratyahara. The sutras are mentioned in the classical work on yoga, Patanjali Yoga Sutra. The first sutra defines the pratyahara and the second one talks about the fruit of practicing it.
Dharana - The concentration. Maharishi patanjali has compiled the yoga sutra on Dharana as "Desha Bhandhashchittasya Dharana". Focussing the chattering mind is necessary whether it is day today life or spiritual life. No work can be accomplished without focus. So lets understand the sutra for better lifestyle.