This is a 23 slide powerpoint I use at the beginning of the year to go over the genres I use in my 9th grade classroom. These range from traditional literature (the "classics) to poetry to fantasy to informational texts.
The powerpoint provides descriptions, definitions, characteristics, and examples for each of the 9 genres, and also allows for a LOT of interaction/engagement from the students as they provide their own background knowledge and examples for many of these.
The powerpoint is set up so that there is a probing question slide prior to giving students an actual definition of that particular genre (I find that on this slide students go kind of crazy shouting out their own examples), then a definition/characteristics slide, then teacher-provided examples.
I also have an accompanying guided notes sheet I use. Just email me and I will provide that free if you'd like it.