Three is a powerful number. We see it all around us in the natural world. Triangles. Pyramids. three main parts of our bodies: head, torso and limbs (legs and arms); father, mother, and children; birth, life, death; and so on. Three is also an important number in writing. Every type of writing, from paragraph to essay, to book, has three main parts: an introduction, body, and a conclusion. An essay often consists of five paragraphs, with three body paragraphs after the introduction and before the conclusion. So remember whenever you write, divide your writing into three parts.