Sweep a profile curve along a path curveSurfaces > Swept Surfaces

Modeling > Create geometry > Build simple surfaces >

Sweep a profile curve along a path curve

Use Extrude to create a surface in the form of a profile curve traveling along a path curve. It does not have the continuity options of the Rail surface tool.

Choose Surfaces > Swept Surfaces > Extrude .
Click the generation curve or curves you want to extrude.
Click Go.
Click the path curve to extrude along.

What if...?

I need more control over the surface, or I need the surface to maintain continuity with other surfaces?
See Sweep generation curves along rail curves (Rail)
The surface is bent or twisted?
If the path curve has severe bends or corners, the extruded surface can have unwanted twists.

To correct this problem, use the Object Edit > Insert tool to increase the number of edit points/CVs on the path curve in the problem areas, so that transitions between CVs are more gradual.