One of the Trimurtis, Shiva is the supreme God in the Shaiva tradition of Hinduism. In the Smartha tradition, he is one of the five primary forms of God.

Followers of Hinduism who focus their worship upon Shiva are called Shaivites or Shaivas (Sanskrit Śaiva). Shaivism, along with Vaiṣṇava traditions that focus on Vishnu, and Śākta traditions that focus on the goddess Devī are three of the most influential denominations in Hinduism.
In some other Hindu denominations, Brahma, Vishnu, and Shiva represent the three primary aspects of the divine in Hinduism and are collectively known as the Trimurti. In this school of religious thought, Brahma is the creator, Vishnu is the maintainer or preserver, and Shiva is the destroyer or transformer."From Shiva"