LCD projectors are a popular choice for several reasons, really. LCD projectors can be outfitted for any projection purpose; from portable projectors weighing only a few pounds to large venue...
Using projector can look neat and professional. Masking way can be used to hide the content that you haven't say them. Then you can reveal one piece of information at a time when you talk about it.
Advantages: able to project large images Disadvantages: Low visibility in brightly lit rooms and the screen has to be flat or else the image will be warped. Loud cooling fans and bulbs are expensive.