The Bhagavad Gita · core concept · हिंदी में पढ़ें
Atman — the self that is not the body
आत्मन् (ātman)
In one sentence
Atman is the deepest sense of "I" — not the personality, not the body, not the story, but the bare awareness in which all of those appear.
The depth — what it actually means
The Gita teaches that the real you is not the body that is born and dies, not the personality that changes, not the role you play, not the biography you tell. The real you is the awareness in which all of those arise. Atman is unborn, undying, eternal, untouched by any change in the field of experience. Verses 2.20–2.25 are the Gita's most concentrated teaching on atman. Chapter 13 develops it with the field/knower-of-field metaphor.
Modern application — how to use this today
When you say "I", listen for which "I" is speaking. The "I" who is hungry is the body. The "I" who is angry is the mind. The "I" who notices both is closer to atman. Most spiritual practice is just the slow shift in the centre of gravity from the first two "I"s to the third.