An introduction is meant to draw the reader in, give them a preview of what the paper holds and convince them that reading it will be a rewarding experience – no pressure, right?
The introduction often isn't included as you are brainstorming your way through the outline for your paper.
Although the introduction isn't typically part of your outline, your outline should be a part of the introduction.
There are several different ways you can hook your reader's interest when writing your introduction.
Planting a hook at the beginning gives you a way to use a common narrative or return to your original ideas throughout the paper which can give the entire essay more flow as well as setting the stage for you to have a convenient way to bring it all together in the conclusion.