Using visual aids such as charts, graphs, diagrams, and slides can make a speech more clear, effective, and memorable. Common technology for visual aids includes overhead projectors, slides, and LCD displays. Visual aids should be used to present data and support the key points of the presentation. When using charts, graphs, and diagrams, present the right amount of information so as not to overwhelm the audience, check figures for accuracy, and use large fonts so they are visible from the back of the room. It is also important to properly set up and use any slide or overhead projection equipment.