Ansible works over SSH. You install Ansible on your local machine and it connects over SSH to run the playback.
To your VPS it looks like a user has logged in and is running commands. It's very useful for remote management of thousands of servers because you don't need to install anything, they just need to have SSH enabled.
Boiling Point.
It's about a single shift in a restaurant and it's all one shot. I thoroughly recommend it.