Author's+Purpose

What is the Author's Purpose? Can you add an example of each of these reasons?

.**Author's Purpose..** . || . . || . . ||  ||   || . ||   ||   || . ||   ||   || . ||   ||   ||
 * .this means...**
 * .an example of this type of writing is..**. ||
 * .to inform or teach
 * .to entertain
 * .to persuade or convince
 * ..because it's fun to write
 * ..because it's fun to write