An illustration is mostly a picture or a drawing. Sometimes, the act of creating that picture is also called illustration. Illustrations, thus, are pictorial representations of things seen or imagined by the person creating them.
What is the best free illustration software?
The market is full of graphics software. When talking about vector graphics, the most popular is Adobe Illustrator. It’s not a free program, so you must pay for it. Here you can download Adobe Illustrator.