The Slide Layout task pane consists of different types of layouts. These layouts can be used to organize placeholders on a slide. A placeholderis an area that contains text such as the title of the slide or a bulleted list, content elements - pictures, charts, and tables. The layout options are arranged in four areas. These are:
Text Layouts: area consists of layouts that provide placeholders for title, subtitle, and text that can be added to the slide
Content Layouts: This area consists of layouts that provide a blank slide and title and placeholders for the content elements.
Text and Content Layouts: This area consists of layouts that provide placeholders for a title, a bulleted list, text and content.
Other Layouts: area consists of layouts that provide placeholders for a title and objects - chart, media clip and combination of content elements
You can modify the layout of a slide, by selecting the slide and clicking the required layout in the Apply slide layouttask pane. PPT templates are predefined formats that contain font styles and slide backgrounds. You can select a template depending on the purpose and audience of the presentation. With Templates you can provide consistent format and look to your presentation. When you apply a design template to an existing presentation PowerPoint automatically updates the text styles and graphics, and color.