Difference Between Isometric, Oblique and Orthographic Drawing

Isometric drawings have horizontal lines drawn at a 30 degree angle and vertical lines remain vertical. Lines in Isometric drawings do not converge.

Oblique drawings are pictorial, two-dimensional images of three-dimensional objects. In oblique drawings, the axis is perfectly horizontal.

Orthographic drawings also represent a three-dimensional object in two dimensions. Orthographic drawings are also drawn to a vanishing point where they converge.