In Shaivism, the guru holds a significant role in guiding and leading individuals on their spiritual journey towards attaining union with Shiva, the supreme being. The word "guru" is derived from the Sanskrit word "gu" which means darkness and "ru" which means remover. Therefore, the guru is seen as the one who removes the darkness of ignorance and leads the disciple towards enlightenment.

The guru is considered as the embodiment of Shiva himself, and thus, holds a high position of reverence and respect in Shaivism. The guru is seen as a spiritual guide, teacher, and mentor who imparts knowledge and wisdom to the disciple. The guru is believed to have a deeper understanding and connection with Shiva and can guide the disciple towards realizing the ultimate truth.

One of the main roles of the guru in Shaivism is to initiate the disciple into the path of devotion and guide them in their spiritual practices. This initiation, known as "diksha," is a sacred ritual where the guru transfers their spiritual energy and blessings to the disciple, opening the door to spiritual growth and enlightenment. The guru also provides the disciple with a mantra, a sacred sound or phrase, to chant during their meditation practice, which helps in connecting with Shiva.

Moreover, the guru is responsible for guiding the disciple on the path of self-discovery and inner transformation. The guru helps the disciple to overcome their ego and attachments, which are seen as obstacles in the path of devotion. Through various teachings and practices, the guru guides the disciple towards realizing their true nature and the oneness with Shiva.

In addition to being a spiritual guide, the guru also plays a crucial role in the social and cultural aspects of Shaivism. They are seen as the guardians of the Shaivite tradition and are responsible for preserving and passing on the teachings and practices to the next generation. The guru also performs various rituals and ceremonies, such as puja (worship), on behalf of the disciple, thus facilitating their spiritual progress.

In conclusion, the guru holds a vital role in Shaivism as the one who guides and leads individuals towards the ultimate goal of union with Shiva. They are seen as the source of spiritual knowledge and wisdom, and their guidance is essential in the disciple's journey towards enlightenment. The relationship between the guru and disciple is considered sacred and is based on trust, devotion, and surrender. Thus, the role of the guru in Shaivism is highly valued and respected, and their presence is seen as crucial in the spiritual growth of an individual.