What is a twitch Sub Link?

[kindangrysliceofpie]

Hey everyone. I was streaming with a friend earlier when someone in my chat asked for a "sub link" I have no clue what this means, and id like a subscriber. Can anyone help?

 

[Soda-88]

You need to have affiliate or partner status to be eligible for a sub button:

https://help.twitch.tv/customer/portal/articles/2785927-joining-the-affiliate-program