First, a flash? Well Flash refers to both the Macromedia Flash Player and a multimedia authoring program used to create the content should be (like games and movies). Flash Player is a client application available in most browsers. It provides support for vector and raster graphics, a scripting language called Action and downlink of streaming audio and video.
Macromedia Flash is the integrated development environment (IDE) and Flash Player is the virtualused for the machine to run the Flash files, but now these terms have been mixed: "Flash" can be a writer environment, the player or the program file means.

Since its launch in 1996, Flash technology is a popular method for adding animation and interactivity to web pages. Flash can be used to create fantastic animations, page elements for web design and even add video websites. Flash Web sites can be much moreinteractive and flashier (pardon the pun) that the site was built with only HTML.

Flash files, or "flash movies", usually a file. Swf extension and as part of a web page or to be "played" in a standalone Flash Player. For more information visit [http://www.webdesign-resource.info]

Due to the extensive use of Flash in Web advertising and the additional time needed to load these pages, there were tools to block Flash content in whole or part of the websites or temporarily or permanently turning Flash Player, Flashblock and Adblock for Mozilla Firefox.
If Flash is disabled in your browser so that users can access sites depend not flash, interface, or a user may experience impaired.
Using Flash content stores the contents of the site into a binary file, such as Flash animation, web site design is not static. This makes content-based Flashsuitable for indexing by search engines.
'Abuse' of Flash software has led to the creation of a new industry term "Flashterbation" where technology is used in a way that lacks customer focus.