S'iva is the Supreme aspect of God that transcends all universes and is in constant unity with Krishna. Because they are inseparable we always think in terms of S'iva/Krishna.
S'iva is Pure Consciousness when without Parvati - pure Nirguna Brahman. With Parvati, He becomes the Saguna Brahman for the purpose of the pious devotion of His devotees. Devotees of Rama must worship Lord Siva also. Rama Himself worshipped Lord Siva at the famous Rameswaram. Lord Siva is the Lord of ascetics and Lord of Yogins, robed in space (Digambara).
Lord S'iva, in reality, is the Regenerator and not the Destroyer. Whenever one’s physical body becomes unfit for further evolution in this birth either by disease, old age, or other causes, He at once removes this rotten physical sheath and gives a new, healthy, vigorous body for further quick evolution. He wants to take all His children to His lotus feet quickly. He desires to give them His glorious Siva-Pada. It is easier to please Siva than Hari. A little Prem and devotion, a little chanting of His Panchakshari, is quite sufficient to infuse delight in Siva. He gives boons to His devotees quite readily.
Lord S'iva is the God of Love. His grace is infinite. He is the Saviour and Guru. He is engaged in freeing the souls from the thraldom of matter. He assumes the form of Guru out of the intense love for mankind. He wishes that all should know Him and attain the blissful Siva-Pada. He watches the activities of the individual souls and helps them in their onward march.
Lord S'iva is an embodiment of wisdom. He is the Light of lights. He is Parama Jyoti or Supreme Light. He is self-luminous or Swayam Jyoti. The dance of S'iva represents the rhythm and movement of the world-spirit. At His dance, the evil forces and darkness quiver and vanish.
S'iva means that which is eternally happy or auspicious, Parama-Mangala. Om and S'iva are one. Mandukya Upanishad says: Santam Sivam Advaitam. Even an outcaste can meditate on the Name of Lord S'iva.
Lord S'iva is the Supreme Reality. He is eternal, formless, independent, omnipresent, one without a second, beginningless, causeless, taintless, self-existent, ever free, ever pure. He is not limited by time. He is infinite bliss and infinite intelligence.