Can I connect my MacBook Air to the internet through a USB dongle?

I guess the first question should be why do you want to do this? The MacBook Air has both a standard Ethernet jack and WiFi capabilities to connect to a router or modem. When you say USB dongle, what exactly do you mean?

For as far as I know, you can

If you are having an issue, please provide system and issue details and context.

What model and year Mac?

What dongle exactly?

What happens when you try to connect?

Error messages?