Vector graphics file types are typically generated by drawing or illustration programs (e.g. Adobe Illustrator, CorelDRAW) and are composed of mathematically-defined geometric shapes-lines, paths, objects and fills. Since vectors entail both magnitude and direction, vector elements thus are comprised of line segments whose length represents magnitude and whose orientation in space represents direction. Vector graphics usually are easily modified within the application, which created them and generally are not affected detrimentally by scaling (enlarging or reducing their size) compared to raster or bitmap image file types, where image scaling reduces picture quality. Because vector elements are mathematically-defined, scaling simply requires modification of their mathematical locations. However, vector files don't support photographic imagery well and often can have difficulties with cross-platform exchange. The most used vector graphics formats are for example: SVG (Scalable Vector Graphics), AI (Adobe Illustrator Graphics), CDR (CorelDraw Vector Graphics), WMF (Windows Metafile Format) and DRW (Vector Drawing file). Source.