These opening lines (sometimes called hook sentences) grab readers’ attention.
They provide just enough information to leave your audience wanting more.
A book review may begin with a summary of the book and conclude with an overall assessment of it.
A policy briefing usually includes an introduction but may conclude with a series of recommendations.
Your introduction should tell the reader what to expect from your essay. Do not give very broad background information on the general topic, but focus instead on what is relevant to answering the set question.
There isn't one way to write an introduction, and following one particular structure could lead to your introductions becoming very formulaic.
A good introduction should identify your topic, provide essential context, and indicate your particular focus in the essay. A strong conclusion will provide a sense of closure to the essay while again placing your concepts in a somewhat wider context.
It will also, in some instances, add a stimulus to further thought.
A killer opening line and catchy introduction are exactly what you want for your essay.
You want to write an essay introduction that says, “READ ME!