Goal: Create your first web page
A persona is an imaginary caricature of specific demographics that share a common set of problems. For instance, a persona for home buyers might be first time home buyers. While their ages and income levels might vary greatly, they all share the same set of problems. They don't know exactly what to look for. They've never done this and they're very worried because their afraid they'll waste their money and look foolish. BUT, they also share a common set of opportunities. They don't need to sell their old home before they move so they're flexible on timeline.
There's a great book that we site in interaction design all the time called About Face by Alan Cooper. Cooper is very respected in the interaction design community. It's available for free if you search for it. You can connect to the Safari Books Online and read it for free (well, not for free! Your tuition is paying for this awesome service, but you get the idea).