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Atma means the self or the soul. This is what we really are—the spiritual spark inside our body—as distinct from what we mistakenly think we are—our body and mind. Generally we think of ourselves in terms of the various labels we've had pinned on us—American, English, Christian, Hindu, white, black, liberal, conservative, father, mother, Jones, Smith, man, woman, or whatever. But these are only temporary tags. Time unpins them and replaces them with new ones. After all, the label is different from the merchandise.
Therefore, although atma sometimes refers to one's temporary body, mind, or intelligence, the atma is ultimately the eternal consciousness (the spirit, or soul) that is present within the body of every living being. This atma—higher than the senses, the mind, and even the intelligence—is most mysterious and subtle.
(Image illustrates that bodies may differ but all atmas (souls) are spiritually equal.)
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The Bhagavad-gita describes it in this way: "For the atma there is neither birth nor death at any time. He does not come to be, has not come to be, and will not come to be. He is unborn, eternal, undying, and primeval. He is not slain when the body is slain . . . .The atma can never be cut to pieces by any weapon, nor burned by fire, moistened by water, nor withered by the wind. This individual atma is unbreakable and insoluble, and can be neither burned nor dried. He is everlasting, all-pervading, unchangeable, immovable, and eternally the same. ( 2.24).
One who realizes this eternal atma within himself—that is, one who recognizes himself to be the eternal consciousness or soul within the body—becomes a perfectly self-realized person. There are innumerable atmas, all in essence the same yet each eternally distinct. And above all these atmas is the Paramatma, or supreme atma—God. God, too, is distinct from all other living beings, and this distinction is eternal. God, the supreme infinite, is the complete spiritual whole, and all other living beings are infinitesimal parts of God. A living being can never "become God" any more than a drop of water can become the entire ocean.