You can use Flash to create vector-based interactive animation or a vector graphic, plus you can incorporate sound. An action is a property assigned to a graphic or button which enlisits a response. Frames define each moment in the Flash movie. A frame may be a keyframe if it defines a change in the animation.
Import is a general term used to pull an image etc.
Layers help with the organization of your Flash movie, such as, keeping symbols and other objects separate. Loop refers to an animation which runs over and over. A symbol is a reusable object in Flash. These can be a graphic, button, or movie clip. This becomes important when using tweening to create animation.