The 16th chapter of the Krishna Yajurveda contains 66 mantras and they are known as Sri Rudram. Devotees of Shiva perform abhisheka (sacred bath) on Shivling reciting these mantras.
In every mantra, Rudra devata is praised.
He is the embodiment of anger and fury. He is the controller of all vocations. People chant the Sri Rudram to pleas Him.
The mantra is chanted for obtaining auspiciousness. It is also chanted for the destruction of all enemies.