Rendering > 
Rendering Previews and Grabbing Viewports
 
 
 

You can grab a viewport as an image file. You can also generate a preview of an animation. These commands are in the Grab Viewport group on the Tools menu.

A viewport grab (Create Still Image File) appears in a Rendered Frame Window, where you can save it to a bitmap format.

A preview (Create Animated Sequence File) can help you preview the animation in your scene. The preview uses lighting but not materials, so it renders much more quickly than a fully rendered animation.