An illustration paragraph is essentially a definition which illustrates the subject. This is a condensed form of information, but in prose style, providing roughly the dictionary meaning in a narrative way.
Examples of Illustration
LifeLife is a characteristic which is given to the existence of both organisms in the literal sense of being alive. The concept of life further develops as the 'life' of a product, an idea or concept, a state of existence expressed as an analogous continuum similar to that of life. Life is used as an analogy from inception to end of a process, like 'for the life of the project'.