Video

Video is an ordered sequence of graphics, images, and audio that change over time. The sequence plays in an animated, natural way, which appears to a viewer to be similar to their normal capacity for viewing events in real life with their eyes and ears. A video or movie can thus capture events as they happen in real time, or render entirely new visual scenes for a viewer using a camera and computer.

Video is one of the most common media that are used to convey information today. Because an image can convey different image than words alone, videos frequently use many forms of information, including video photography of people and places over time, as well as text, graphics, and other information that can be included in the video, such as titles, pop-ups, icons, and informational graphics. Video-based communications are common in educational contexts, as the video combines the benefits of text, a person's real-time speech, and visual cues to help learners understand information.

Videos are composed of frames, or still images, that are played rapidly over time. Most modern videos start at 24 frames per second, but can be as high as 60 or 100 in high definition settings, and even higher in some specialized contexts. The more frames per second that can be captured by a camera and delivered by a video software, the more detail that will be captured in each second. However, the human eye can only perceive sequential changes in an environment up to a point, with 60 frames per second being a common point where humans fail to see changes in any additional frames per second after 60.

Videos are edited using video editing software, which allows a person to line up in a sequenced timeline each of the visual and audio elements that they wish to include. When the video is compiled, it can be exported as a playable media file that will work on most devices. Additionally, video is commonly streamed today, or stored and accessed over the internet, so that the viewer does not have to wait for videos to download, which often have very large file sizes.

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