Nodejs + phantomjs?

Question

Node.js

I wanted to get acquainted with phantomjs The phantom seems
to be installed separately from the node, and the node can work with the phantom through its modules . Mb .. it confuses me, maybe this is a phantom with control scripts? If not, then it's not clear where such a size comes from. He seems to be faster. Now there is a mess in my head from this, who can clearly explain whether it is necessary to install some modules on the node, which ones are relevant? And then they are not one or two.