Vector images are called for whenever you need to have the option of resizing an image without limit. For example, if you create a logo you’ll need to be able to use it on your website, outside of your office, and perhaps on a large billboard. In this case, a vector image created with Adobe Illustrator is your best choice. This vector file can be exported into numerous other formats that you’ll need later.
It’s important to keep in mind that when the image is displayed in print or on a screen, it will be shown as a raster image. Even the newer SVG format for web graphics is displayed this way on a screen. However, images in this format can be zoomed in and out on without resulting in any pixelation of the kind shown above. Additionally, SVG vector images can be created directly in HTML syntax, manipulated using CSS, and can even be animated.