Brahman refers to the supreme spirit of Hinduism.

All other deities are personifications of aspects of Brahman.

Brahman is eternal without beginning or end, without form, without gender.

Take a glass of water. Add some salt – it will dissolve into the water and you won’t be able to see it or remove it. Now taste the water and you will taste the salt in every drop of the water.

In this analogy the water represents the world and the salt represents Brahman, though invisible Brahman is omnipresent (everywhere.)