Oṃ namo bhagavate Rūdrāya
Lord Śivā, the destroyer of the world, the Supreme deity in Śaivism traditions, the only one deity that performs all the tasks of Trimurti, creation, preservation and destruction. Destruction is not arbitrary but has a great significance in Hinduism. Lord Śivā is also known as Bholenātha, Śaṅkara, Mahāṃdeva, Śaṃbhū etc, and he is very less similar to Lord Viṣṇu in appearance. Both Lord Viṣṇu and Lord Śivā are submissive to each other, except that Śivā's avatāra doesn't worship Lord Viṣṇu. He is depicted as always meditating and experiencing the eternal bliss, he has a close third eye, hair tied in a bun, with a moon and Goddess Gaṅgā on his head. Vāsuki is a snake that is bound around his neck(which represents the cycle of life and death, and has three rounds around the neck that represents the three tenses), he wears a leopard skin, has four arms. Right back hand holds a trident, left back hand holding a small drum, while his forward hands don't hold anything but rather busy in maintaining the meditation posture. Lord Śivā is depicted as having no shape, or nirākāra, and thus Śivaliṅga is worshipped. His vehicle is a bull named Naṇdī.
Lord Śivā has many forms, as an ascetic, as a husband and a father and as a demon slayer. Mostly demons themselves please him to get boons from him because he gives boons to everyone who pleases him. the demons or Rākṣasa used to hate Lord Viṣṇu, but not Lord Śivā. Lord Śivā was there before vedic scriptures appeared, and was the only supreme deity for Drāvidians that later spread in the whole world as the idea of monotheism(Author's thinking).
The fact that Lord Śivā was a drāvidian God was that he taught the beautiful language of Tāmila to Sage Agastya by himself.
When Lord Śivā's third eye opens, anyone in front of him burns into ashes, and Lord Kṛṣṇā's son was too the victim.
Maybe the Rākṣasas hated the fact that there is any other God except Lord Śivā and that's why they started hating Lord Viṣṇu.
Lord Śivā's consort is Goddess Pārvati, also known as Śakti, and his two sons are Gaṇeśa and Kartikeya.