SVG format is useful for preparing scalable illustrations, e.g. for scientific publishing. Use the save-svg command followed by the filename to save SVG drawing out of your active part. It's also possible to save SVG for a topological variable whose name is to be provided with the -var <varname> syntax.
Internally, the exporter algorithm projects the entire input geometry to XOY plane using the precise Hidden Line Removal (HLR) algorithm. The outcome edges are then rendered to the text SVG entities.