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An image depicting a scene in an Axonometric projection. In other words, there are no vanishing points as expected in perspective drawings, and all lines of sight are parallel.
In an isometric image, the scale of an object does not depend on its location. There is no foreshortening, and an object in the very back of a scene will appear to be exactly the same size as a copy of it in the front.

Note that most art drawn this way is technically "Dimetric" (the angle from the ground being above or below the exact angle for isometry) but "Isometric" is commonly used to refer to these in the realms of art and computer graphics.