Slides are the main component of any presentation. They contain the information you're showing to the audience, such as text, pictures, charts, and tables. Before you add any content to a slide, it contains placeholders, which are areas with dotted borders that you can fill with various kinds of content(text, picture, shape, etc). When you add a new slide to your presentation, it automatically assumes the same layout and theme as the preceding slide (a layout is an arrangement of elements on the slide). You can also create your own Custom Layouts. By default, the first slide in your presentation will use the Title Slide layout, which contains a Title placeholder and a Subtitle placeholder. When you add a slide beneath a title slide, it will use the Title and Contents layout.