The SWF (Small Web Format) is a file format used for multimedia, vector graphics, and ActionScript. Originally developed by Macromedia and later acquired by Adobe Systems, SWF files are commonly used for animations, games, and interactive content on the web. They can be embedded in web pages and are designed to be lightweight and efficient for streaming over the internet. SWF files are typically created using tools like Adobe Animate and can include audio, video, and interactive elements. Although their popularity has declined with the rise of HTML5 and other technologies, SWF files were once a standard for rich internet applications and online games.