Notes
When you give your presentation, you should be - or appear to be - as spontaneous as possible. You should not read your presentation! You should be so familiar with your subject and with the information that you want to deliver that you do not need to read a text. Reading a text is boring! Reading a text will make your audience go to sleep! So if you don't have a text to read, how can you remember to say everything you need to say? With notes.