Logos, Ethos, Pathos
Wayyy back in the day, when I was taking 'Writing to the World Wide Web', I was part of a group assignment to define Ethos, Logos and Pathos. The website still exists. It's almost fourteen years old and ranks wicked high in Google for some reason. It gets referenced a bunch, linked to, etc, etc. AND I HAVE NO IDEA WHY. Anyway, there used to be a copy of it on this site as well, and it's coming up in searches here also. I might rebuild a local copy, but for now here's a link
In order to be a more effective writer, you must understand these three terms. This site will help you to better understand their meanings and show you how to make your writing more persuasive.
That class pretty much defined my future. I learned a lot, worked with great people, and have a lot of great memories.