In general, vector graphics are graphics based on abstract object
s instead of pixel
s, i.e. a line is characterized by the coordinate
s of its start and end points and its thickness instead of a bunch of pixels. Common objects are
boxes, circles, polygon
s and polyline
s. Using spline
it is possible to have complex round shapes. Letters of text objects are made up of splines.
Vector graphics have the huge advantage that they can be scaled to any size and resolution and always look perfect.
They are commonly used for CAD-type applications and in presentation programs.