Dose the HDMI Cable have Audio Support or do I need to use the Optical Audio Port on the ATV?

I recently noticed that the Apple TV has an "Optical Audio" port on the back, next to the HDMI port. Before I buy one, will I need to buy a Optical Audio cable, or will the HDMI cable suply sound to the TV?

HDMI carries both audio and video. The optical port is for connecting to a receiver/external speakers.

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Apple TV (2nd and 3rd generation): Troubleshooting video issues
http://support.apple.com/kb/TS5148
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Does the HDMI cable carry both video and audio? U

Does the HDMI cable carry both video and audio?
If so what is the purpose of the separate optical audio connection?
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TIA.

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Dose the HDMI Cable have Audio Support or do I need to use the Optical Audio Port on the ATV?

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