SVG stands for Scalable Vector Graphic. Essentially it’s a drawing that you can change the scale of without losing any quality. DXF stands for Drawing eXchange File. This is an AutoCAD file that is open sourced so multiple programs can open it instead of the AutoCAD only version DWG.
You may use AutoDWG online service to convert dxf to svg, it is totally free.
https://www.autodwg.com/dwg2svg/
DWGSee CADDWGSee CAD