An explanation provides a logical series of steps to describe how or why a natural or social phenomenon occurs. It uses present tense verbs and causal connectives. The structure includes an introductory statement, followed by a series of steps that continue until reaching a final outcome or conclusion. When writing an explanation, the author should consider using diagrams, charts or illustrations to aid understanding. The introduction should intrigue the reader and set up the topic. The body should explain what is needed, how and why it works, when and where applicable, and what it is used for. Interesting details can be added, and it should relate back to the reader.