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Axonometric projection is a method of graphical representation used in technical and architectural drawing. It is a type of pictorial projection where the lines of sight are not parallel to any of the principal planes of projection. Instead, the object is rotated along one or more axes before being projected onto a plane. This results in a three-dimensional appearance of the object, where all three dimensions (length, width, and height) can be represented in a single view.

There are three main types of axonometric projection: isometric, dimetric, and trimetric. In isometric projection, the angles between the projected axes are equal (120 degrees), and the foreshortening of the axes is uniform. Dimetric projection involves two equal angles and one different angle, with two axes having the same foreshortening and the third having a different one. Trimetric projection is the most general type, where all three angles and foreshortening ratios are different, providing the most freedom in representation but also being more complex to construct.

Axonometric drawings are useful because they allow viewers to visualize an object's form and spatial relationships without needing to interpret multiple orthographic views. They are commonly used in engineering, architecture, product design, and computer graphics to illustrate assemblies, components, and conceptual designs. The primary advantage is the depiction of depth and volume in a single image, making complex structures more understandable at a glance.