Vectors describe graphics according to their geometric characteristics.
You can then move, resize, or change the color of the circle without losing the quality of the graphic. Graphics created in Adobe Illustrator are vector graphics. Vector graphics are resolution-independent that is, they are not defined by a fixed number of pixels and so are automatically scaled to appear crisp and sharp on any output device at any resolution. Bitmap images, also called raster images , use a grid, or raster, of small squares known as pixels to represent graphics. Each pixel in a bitmap image has a specific location and color value assigned to it.