Hi there, Greetings!
Today, I'm going to talk about one of the most often utilized features after the Extrude/Boss Base. The Revolve feature.
This task is accomplished by the use of an Axis of Revolution as the main reference object. It must be a valid Axis such as a Line, in this case, an Edge of a Part but desirably, a Centerline (or Construction Line). This Axis of Revolution is in which your finished Sketch will revolve around.