What is the process of using "simulator" for networking .?

I have heared about simulator . I know that it is used to learn nwtworking but how i don't know ,help me
What is the process of using "simulator" for networking .?
I not 100% sure on the question, however, if your asking what is the reason for using a network simulator it is simply because networking equipment is extremely expensive and when your building a lab environment network you don't want to spend thousands of dollars. There are also traffic simulators for networks which are often used to test QoS on networks and this is used because you can't test an established network for problems during peak times so you verify that it is working in a simulation or off hours in hopes to avoid harming that network.

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