What does the term "extrusion" refer to in SolidWorks?

In SolidWorks, the term "extrusion" specifically refers to the process of taking a 2D sketch and extending it into the third dimension, thereby creating a 3D solid or shape. This operation involves redefining the geometry of the sketch by translating it along an axis, which effectively gives it depth and volume. The key concept of extrusion is transforming a flat, 2D representation into a tangible 3D object by adding material, which is a fundamental technique in 3D modeling.

Understanding extrusion is crucial because it forms the basis for creating many types of parts in SolidWorks. It is commonly used to generate simple geometric shapes, like blocks and cylinders, or to create more complex features by combining multiple extrusions and cuts. The other choices do not accurately define what's meant by "extrusion" within SolidWorks, as they refer to different processes or dimensions related to 3D modeling.