how can i stream video and audio from macbook air to my tv?
Wirelessly: you need an AirPlay - enabled device such as an AppleTV.
Wired: if your TV has an HDMI port, you need a Thunderbolt to HDMI adapter such as this one:
Mini DisplayPort to HDMI® Adapter w/ Audio Support
If your TV does not have an HDMI port you will need a converter that will convert HDMI input to whatever input your TV requires.
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