After a short introduction to your general field, give an overview of the methods you used, and, perhaps, a hint at what your conclusions are. Since your talk is short, a 3-4 slide introduction is probably sufficient. Be aware of how you appear to your audience. Speak clearly, and loudly enough to be heard in the back of the room. Be enthusiastic about your project, and confident in your presentation.
Time is of the essence in giving a talk.
You want to be certain to convey your main message before your talk is over. It will tell you how many slides can be put into your talk, and will give you confidence about what you want to say. A good ballpark figure is 10-14 slides for a 20 minute talk. Required elements . Your first slide should be a title slide, which contains the title of your talk, your name, your advisor's and collaborator's names, and the date.