What is the name of the service in which you can make hooks for events in the social. networks?

Question

Automation

I know for sure that such a service exists, and it is quite well-known. But I can't find it.
There you could subscribe to an event, for example, on Twitter, and set up a reaction to it.
The name starts with I and is some kind of abbreviation. Like IEFS or something like that.

Answer 1

Hooray, I found it!
The service was called IFTTT https://ifttt.com/