A zine is generally a lo-fi self-published mini magazine. It can be on any topic at all, quickly produced and photocopied or lovingly hand-crafted. You can use any materials you like, they can be made to share with friends, to hand out at events as a creative prompt for discussion. They can be as basic or creative as you like. They are the epitome of democratic publishing.
For some inspiration visit Zineopolis Portsmouth University’s Zine Archive: www.zineopolis.blogspot.co.uk