Explain to a beginner why when you start one application, 10 processes hang in the system?

Question

Node.js

Launched one application (Express.js framework is connected). The application consists of three routers.
HTOP shows as many as 10 node processes.
Version Node 7.7.1
I also noticed that when starting the simplest application node - 6 processes hang in the system.
Please explain to a newbie.

Answer 1

It's threads. 52210 parent process. Some of them jit someone GC. V8 is a big thing.

Answer 2

Just launched a demo application from the off site of the node. Everything is fine, only 1 process hangs.
It seems to me that you have an 8-core processor and the application is running through the Cluster module. In total, one main process + one process per core turned out.