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You create curvature using Beveling or by Subdivision surfaces. The first 3 are parametric modelling techniques - you control limited amount of points to define the surface.
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sculpting (controlling all surface points of complex shape with brushes).box-modelling (dividing a primitive into complex shape).spline-modelling (lofting curves into complex shape).poly-modelling (extruding polygons from a primitive into complex shape).We can distinguish these modelling techniques: Sometimes it's not only one way, but multiple ways are used based on how they are fit. There are many ways how to achieve the end-result shape of your object.
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