Flash is a proprietary web technology developed by Adobe Systems used as a multimedia platform to create animated graphics, browser games, and also used for streaming video and audio.
Flash was quite prevalent on the Internet because of its entertainment value. There seemed to be a widespread misconception that using Flash would enhance a user’s experience and add value to a website. However, in practical terms the opposite was true. Because Flash had no real purpose other than to entertain or serve ads, it added nothing to contextual significance, usability, or page performance; and worse yet, it was harmful to sound SEO practices.