Show only posts from 1 category

Does anyone know how to do this, if it can be done in WP can you supply a link to a tutorial or even just tell me which tags I might use?

I am editing a theme to have a page that has 9 divs in rows of 3 and I want each of them to display the posts of a particular category and only that category. Is this possible? Suggestions? Ever seen any examples? I would love to know for certain that it can be done at this point! Thanks so much in advance for any helpful input. -c-