What is a primary use of the Helix feature in SolidWorks?

The Helix feature in SolidWorks is primarily used for generating spiral shapes. This can include creating helical curves or paths that may be used for a variety of applications such as designing screws, coils, or springs. The Helix allows for precise control over the number of turns, diameter, and pitch of the spiral, which makes it an essential tool for modeling complex shapes that follow a helical pattern.

In contrast, straight lines can be created using basic sketching tools, while defining circular patterns involves using the Circular Pattern feature which duplicates features around a center point. Making rectangular features is typically achieved through the use of extrudes or revolves, relying on different sketch tools rather than the Helix function. Hence, the usage of the Helix feature is specifically aligned with creating spiraled or coil designs, making it a unique and valuable option in the design process within SolidWorks.