What is Flash

Macromedia Flash is a proprietary, robust graphics animation/application development program used to create and deliver dynamic content, media (such as sound and video), and interactive applications over the web via the browser. It is not a standard produced by a vendor-neutral standards organization like most of the core protocols and formats on the Internet.

Many graphic artists use Flash because it gives them exact control over every part of the design, and anything can be animated and generally "jazzed up." Some application designers enjoy flash because it lets them create applications that don't have to be refreshed or go to a new web page every time an action occurs. There are many sites which forego HTML entirely for Flash.

Flash detractors claim that Flash websites tend to be poorly designed, and often use confusing and non-standard user-interfaces. Up until recently, search engines have been unable to index Flash objects, which has prevented sites from having their contents easily found. It is possible to specify alternate content to be displayed for browsers that do not support Flash. Using alternate content also helps search engines to understand the page, and can result in much better visibility for the page

Source http://en.wikipedia.org/wiki/Web_design

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