What is brahmand?

Brahman is a concept of the vedas. Brahman is the absolute reality and is the fundamental principle which lies realized in the whole universe”. Brahman is a key concept found in the Vedas, and it is extensively discussed in the principal upanishads. The Vedas conceptualize Brahman as the Highest Reality and the Cosmic Principle.

Who is soul?

He, who is called as Brahma = the most High, Parmatma = the supreme Spirit
who permeates teh whole universe; Who is true personification of Existence,
Consciousness and Bliss; whose nature, attributes and characteristics are Holy;
who is Omniscient, Formless, All-pervading, Unborn, Infinite, Almighty, Just
and Merciful; who is the creator, administrator and dissolver of the whole
universe, and who awards all souls the fruits of their deeds in strict accordance
with the requirements of absolute justice and possessed of like attributes, is
God.

2. Brahman is the fundamental principle of everything that exist. 

3. The ancient philosophy of god 

Brahman and ishvara

Ishvara is a concept in the the vedas.

Ishvara is a concept found in the vedas which is related to god. It is one of the most basic concepts in vedas and ancient vedic philosophy. Ishvara or ishwar is a sanskrit word which means god.

The word god is known as ishvara in sanskrit.

The personal god is known as ishvara in sanskrit. The word Ishvara also means the lord or the controller. The lord or the controller of the universe is called as ishvara.

Ishvara is the inner controller.

It is mention in the rig veda, that ishvara is the inner controller.