Ansible Handler notify vs register

Question

So after reading Ansible docs, I found out that Handlers are only fired when tasks report changes, so for example:

some tasks ...
notify: nginx_rest         


        

Answer 1

On the Ansible Variables page, you can see how register works.

Another major use of variables is running a command and using the result of that command to save the result into a variable.

Registered variables are just like facts:

Effectively registered variables are just like facts.

This is very different from notify, which triggers handlers. It does not save or store variables or facts.