Multimedia applications typically contain text in a variety of typefaces and appearances. Text is used to deliver content, as well as for instructions, menus, and hyperlinks. Types of images include photographs, drawing, company logos, and other static images. Common graphic formats include GIF (Graphics Interchange Format) and PNG (Portable Network Graphics) for line art images, and JPEG (Joint Photograph Experts Group) for photographs. Animation consists of a series of graphical images displayed one after the other to simulate movement. Audio includes all types of sound, such as music, spoken voice, and sound effects). Video is a continuous stream of visual information captured as a series of separate images or frames. Audio, video, and images are frequently compressed to reduce the finished file size. Web-based audio and video can be delivered as streaming in order to reduce the amount of time required before the content begins to display.