The animation timeline is the numbered bar just below the animation views. The numbered increments represent the number of frames set for your animation; when you’ve set key frames, you’ll be able to see the keys represented as either red or white circles along this timeline. The number of frames displayed will change according to the number of frames you’ve set for your animation. You can right-click on any keys displayed to display a list of all keys in that frame, and you can drag the keys between frames.
If any audio is attached to the sequence, its waveform is also displayed below the timeline. The pink and white area below and to the left is the track bar.