Adobe Flash has historically been called Shockwave Flash and more recently Macromedia Flash but has come to be simply Flash. Flash is a set of multimedia technologies developed and distributed by Adobe Systems since December 2005, when Adobe Systems acquired Macromedia. Since its introduction in 1996, Flash technology has become a popular method for adding animation and interactivity to web pages; Flash is commonly used to create animation, advertisements, various web page components, to integrate video into web pages, and more recently, to develop rich Internet applications.

Flash can manipulate vector and raster graphics and supports bi-directional streaming of audio and video. It contains a scripting language called ActionScript. It is available in most common web browsers and some mobile phones and other electronic devices (using Flash Lite). Several software products, systems, and devices are able to create or display Flash, including the Adobe Flash Player. The Adobe Flash Professional multimedia authoring program used to create content for the Adobe Engagement Platform, such as web applications, games and movies, and content for mobile phones and other embedded devices.

Files in the SWF format, traditionally called "Flash movies" or "Flash games", usually have a .swf file extension and may be an object of a web page, strictly "played" in a standalone Flash Player, or incorporated into a Projector, a self-executing Flash movie (with the .exe extension in Microsoft Windows). Flash Video (FLV) files have a .flv file extension and are utilized from within .swf files.

Adobe Labs (previously Macromedia Labs) is a source for early looks at emerging products and technologies from Adobe-Macromedia, including downloads of the latest software and plugins. Flash 9, Flex 2, and ActionScript 3.0 are discussed on the labs.adobe.com website.

An important new development in Flash (as of 2007) is its increasing use in providing the presentation layer in handheld devices. Adobe is aggressively courting cell phone and PDA vendors, and partnering to deploy Flash Lite as the user interface.

A project currently (Nov 2007) in development at Adobe Labs is the Adobe AIR Project which is a cross-OS runtime that allows developers to reuse their existing web development skills (Flash, Flex, HTML, Ajax) to build and deploy desktop Rich Internet Applications (RIAs).

The next version of Flash will have two additional components designed for large scale implementation. Adobe is adding in the option to require an ad to be played in full before the main video piece is played. This would be most useful for large scale video sites. Also, Adobe has announced plans to add DRM into the new version of Flash. This way Adobe can give companies the option to link an advertisement with content and make sure that both are played and that they are not changed.