Vector Art Or Vector Illustration Is A Conversion From A Raster (Low Resolution) Images To A Vector (High Resolution) Images Mainly For Printing Purpose. Printing Has Much Higher Resolution (Typically 600 Pixels/Dots Per Inch, DPI) Than What You See On A Computer Screen (Typically 72 Pixels/Dots Per Inch, DPI). This Means That While Something Might Show Just Fine On Your Screen, It Is Going To Look “Grainy” Or Pixilated When Actually Printed.