how do I connect my macbook air to my tv

What model of MacBook Air exactly? What ports does it have?

Identify your MacBook Air - Apple Support

Identify the ports on your Mac - Apple Support

If you have one with a Thunderbolt / MiniDisplay port, you can use a Mini Display Port to HDMI adapter and an HDMI cable.

For the MacBook Air Early 2015 you need one of these: Moshi Mini DisplayPort to HDMI Adapter (4K) - Apple

For the iPad: Lightning Digital AV Adapter - Lightning to HDMI - Apple

Hi Henrynorth,

Are you referring to physically connecting your MacBook Air to your TV, or using AirPlay with a supported Apple TV?