What type of drawing is primarily used to depict three-dimensional objects in a two-dimensional format?

Isometric drawing is a method used to represent three-dimensional objects in a two-dimensional format, allowing for an accurate visualization of the object's dimensions and relationships. In an isometric drawing, the three axes of an object are represented at equal angles (120 degrees apart), which helps showcase depth without distortion. This method enables the viewer to understand the object's size and shape more intuitively than other drawing types.

While orthographic drawing also conveys three-dimensional aspects, it does so in a series of two-dimensional views (top, front, side) that don't provide a single cohesive visual impression of the object. Perspective drawing creates a sense of depth by illustrating how objects appear smaller as they are farther away, but it does not consistently maintain scale across all dimensions. Section drawings provide a view of an object's interior by slicing through it, which is useful for understanding internal features but does not represent the object as a whole in three dimensions.

Therefore, isometric drawing stands out as the most effective choice for depicting three-dimensional objects in a clear and understandable two-dimensional format.