Introduction

Often considered the most important paragraph of your essay, a well-written introduction creates a road map for the entire essay. 

An excellent introduction should ...

The structure:

Consider the inverted pyramid structure:

Example:

Knowledge is the most powerful tool to improve society. However, when knowledge is used selfishly, to grab and maintain power or to manipulate the masses, it is the most dangerous force.  In William Golding's post-World War II allegory, Lord of the Flies, this concept is made painfully clear. Using symbolism and imagery, Golding explores the idea that knowledge used for personal gain becomes an evil force,  ultimately causing society to collapse.