What type of feature is a "Fillet" in SolidWorks?

A fillet in SolidWorks is specifically a feature that creates a rounded edge between two surfaces or edges. This is a commonly used feature in 3D modeling as it helps to eliminate sharp corners, which can be weak points in a design and can make parts difficult to manufacture or assemble. By applying a fillet, you provide a smooth transition between adjoining surfaces, which can also enhance aesthetic appeal and reduce stress concentrations in areas where forces may be applied.

Fillets are especially useful in applications where fluid flow is significant, as a rounded edge allows for smoother flow paths. They are also applied for ease of handling, as rounded edges tend to be safer and more ergonomically friendly. Additionally, using fillets can improve the manufacturability of a part when creating molds or CNC machining.

The other options refer to different features that serve other purposes in SolidWorks. For instance, creating a hole, adding thickness, or mirroring components do not pertain to the functionality of a fillet. Understanding the role of a fillet is essential for effective 3D design and engineering methodologies.