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The feature that is specifically used to change the shape of a part by blending multiple profiles is the loft. Lofting allows you to create a smooth transition between two or more different shapes or profiles, creating complex geometries that cannot be easily achieved with simpler commands.

In the loft operation, you can define the start and end profiles and potentially additional cross-sections along the path. This flexibility makes it especially powerful for creating organic shapes and transitional volumes in modeling. For example, when creating an aerodynamic body or a custom-shaped component, lofts provide control over the profile at various sections while ensuring a seamless blend.

The other features, while useful, serve different purposes. A sweep is used to create a shape by moving a profile along a defined path, which is effective for extruding along a curve but does not blend profiles. A revolve creates a shape by rotating a profile around an axis, which is excellent for cylindrical shapes but limited to circular or rotational geometries. A fillet, on the other hand, is used to create rounded edges or corners on models, which does not involve blending multiple profiles into a new shape.