Any graphical work (especially advertisement) or any work of art that is poorly designed will not persuade the audience. therefore, for an advertisement to persuade and convince readers or viewers, it must be well designed with needed graphical tools so as to bring profit to the designer or advertiser.
Graphics contribute to the general outlook of a designed artwork, this, in turn, lure interested members of the public to look at the work of art or purchasing it.
The editorial cartoon, also known as a political cartoon, is an illustration containing a political or social message. An illustration is a visual representation such as a drawing, painting, photograph or other work of art that stresses subject more than form.
In contemporary usage, it includes a pictorial representation of data, as in c manufacture, in typesetting and the graphic arts, and in educational and recreational software. Images that are generated by a computer are called computer graphics.
Source: Wikipedia