Shiva is pure welfare… Shiva is pure Brahman. Shiva is the aura of the Sun. With the influence of Shiva and Shakti, the sun is able to disperse light and heat.
ब्रह्मा विष्णु सदाशिवजानतअविवेका।
प्रणवाक्षरमध्य तीनों ही एका॥
Goswami Tulsidas has also seen Shiva and Shakti as-
भवानी शंकरौवंदे श्रद्धा विश्वास रूपिणौ।
That is, I offer obeisance to Bhavani and Shankar in the form of reverence and faith, without whose devotion, no Siddha Yogi can see the situated God in his conscience.
Yoga is the gift of Mahadev
Today, the whole world is recognizing yoga. But the knowledge of this was first given by Baba Bholenath to the world. Therefore, all their pictures are found in different yoga postures. Sadasiva is depicted as a yogi in most of his paintings. Lord Shiva is noted for both gentle and rudra postures of yoga.
Shiva is the ruler of the origin, condition and destruction of the universe. Shiva is the source of eternal and creation process and this period is the basis of knowledge and science. The meaning of Shiva is considered to be welfare, he has always possessed both rhythm and holocaust.