Sometimes you want to add effects that is graduated over several frames.

For example, moving a car from the left side of the movie to the right side of the movie.

Instead of moving the car a little bit on each frame, you can simply do like this:
 

• position the car on the first frame only,
   
• then insert a keyframe where the car will stop
   
• and finally tell Flash to tween between the two keyframe.
   

Basically there are three types of tweenings in flash which are as follows:

Step 1
Create a small circle to the left of the Stage area. Do this by selecting the circle tool from left toolbar. Draw the circle in the Stage area only.

Step 2
Select the Arrow tool from left toolbar. Double-click on the circle to select on it.

Step 3
Now the work is to convert the circle to a symbol. When the circle is converted to a symbol we can create instances of circle. From the top of the menu choose Modify > Convert to Symbol. Name the symbol "Ball", and then select OK.

Step 4
Go to the Frame 10 in the Timeline. Do this by clicking gray field below 10. Then right click in this field only. Then choose Insert Keyframe. Keyframes appear as circles in a particular frame. This operation duplicate the image. 

Note: A keyframe specifies whatever changes you have done in an animation. You create keyframes at important points in the Timeline and let Flash create the frames in between.

Step 5
Select the circle and move it to right a couple of inches.

Step 6
Click on the Timeline any place from Frame 1 to Frame 10. Then right click and choose Create Motion Tween.

Step 7
Choose Control > Test Movie from the top of the menu to test your Flash movie.