How do free mobile applications make money?

[AC Question]

Hello,

I am about to publish my first app, and I was just wondering, how do free applications like Tinder for exemple make money? users use it for free, so how come it is worth so many millions?

Thanks

 

[anon(5719825)]

Sometimes the free app has ads built in. many times they offer premium services that are only available to paid members.

 

[kingchum]

The software is free, but the service provided for a fee