programação-reativa

I've read what is Reactive Programming?. The answer sounds good, but it's theoretical. I understand what it is, but I don't k ... ied like this? Need to run on multiple servers? Or is it an option? Is it a paradigm? Is it a framework? Can I use in .NET?

I see in frameworks as Angular, Vue, React, the concept of reactivity. I'm totally layman on the subject, and for what li ... ction(){ console.log('Usuario fez alguma ação que mudou a variavel') variavel = 2 }, 5000) } Usuario() observable()