Rendering the scene
Using the batch export feature
After all your layers are created, filled, and stroked and all the animation keys are set, you can render out the final results for the current frame using the File, Preview (Ctrl/Cmd+R) menu command. There is also an option to export the final animation to several different formats, including AVI, QuickTime, and Flash.
Rendering a scene provides a way to check your project along the way. Often when rendering a project, you can see that the layer stacking or the fill effect of an object is incorrect and discovering these errors before exporting can save you some time.