animation
add Start frame of the scene and End frame of the scene. add button Stop/Play, Loop, Audio .
Stop stops the animation or simulation playback. You can do any of the following to stop the playback:
Click the Stop icon.
Press the Down Arrow key.
Click any mouse button anywhere in the viewports or timeline.
Loop repeats the animation or simulation in a continuous loop.
You can also choose Playback Playback Options and select the Loop option in the Play Control property editor.
See Looping the Playback for more information.
Audio toggles sound on/off during playback. It is on by default. When the audio is off (muted), the icon appears highlighted.
See Audio and Animation [Nonlinear Animation in the Animation Mixer] for more information.