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An illustration is the interpretation in a form of sketch, painting, photograph, computer generated imagery or any other art work, which is created to demonstrate or dictate sensual information from an essay, poem, story or a newspaper article. The concept of illustration goes way back in time when prehistoric cave paintings of ape man and animals were found on the cave walls and ceilings. With the passage of time, illustrations took different forms and techniques. Earlier somewhere around in 15th century, books were illustrated with woodcut illustration whereas engraving and etching later took over the former illustration technique after a century or two. Let us briefly walk-through some of the classical, yet well known types of illustration techniques.

Woodcut illustration - woodcut, sometimes also known as xylography is a technique in which an image is engraved or imprinted into the surface of the wooden block. Then this wooden block is dipped into an ink or colour and is pressed onto the pages of the book to print the illustrations. The technique of woodcut was developed in somewhere in Europe in the 15th century.

Engraving illustration - engraving is the technique of incising (carving) an illustration or design onto a hard flat surface such as stone or a metal plate. Although this technique is as old as middle stone age, it is still in use today. During stone age there were stone engraving in the caves, but today goldsmith uses this technique to engrave illustration on jewellery and other precious artefact.