Pixels and vectoring

Pixels DPI-dots per inch

Computer screen output is 72 dpi printing output is 300 dpi, if dpi too low printed result will look poor quality.The more dpi image has the more memory it requares.In 72 dpi image while looking at original image it looks like realy sharp circle but when u zoom in u can clearly see that image is pixelated.

Vectoring

Vectoring is diferent from pixels.It uses computer calculations and diferent from pixels doesnt requare every pixel to be remembered so this results in using up less memory. Also when you zoom in to vector figure computer knows what shape that figure is and doesnt get it pixelated.