Vector diagram: Generally, the graphics displayed in a computer can be divided into two categories-vector diagram and bitmap. Vector diagram uses straight lines and curves to describe graphics. The elements of these graphs are points, lines, rectangles, polygons, circles and arcs. , are calculated by mathematical formulas. For example, the vector diagram of flowers is actually the outline of the outer frame formed by line segments. The color of the outer frame and the color surrounded by the outer frame determine the color displayed by the flowers. Because vector graphics can be calculated by formulas, the volume of vector graphics files is generally small. The biggest advantage of vector graphics is that it will not be distorted regardless of enlargement, reduction and rotation; The biggest drawback is that it is difficult to express realistic image effects with rich color levels. Illustrator of Adobe and Corel's CorelDRAW are too numerous to mention.