You can create all kinds of different elements for the web or for CD-ROMs and devices using Flash. First, you create a file in the Flash authoring tool, which you use to output SWF files. SWF files are the files that you can put online when you embed them in a web page. The Adobe Flash Player plug-in then displays the SWF file, so your website visitors can view or interact with the content.
Your SWF file can contain video, MP3 sound, animations, images, data, and so forth. The benefit of using a SWF file over other formats is that the Flash Player plug-in is incredibly common. Let's get started building a banner:
By default, Flash displays the Start Page (see Figure 1), which enables you to select a recently edited document, create new kinds of documents (Flash files, ActionScript files, and so on), or create a new document using a prebuilt template.

Figure 1: By default, Flash displays the Start Page when it is started.
Tip: Your recent Flash documents are listed in the Open A Recent Item column, which can save you from searching your hard disk for Flash files.
It's a good idea to save a new document when you start working with it (and often thereafter) so you don't lose any of your work. After you finish saving the file, proceed to the following exercise where you will change the document's properties.