Telecommunication Engineering

I'm a recent telecommunication engineering graduate. 
I hope anyone who has an experience in this field to can tell me about
and explain to me the difference between network, mobile network and IT.

I worked in Telecom for a number of years as a project manager and program director.

Below are my changes to your notebook entry..

Telecommunication Engineering

I'm a fresh graduate from telecommunication engineering., 

i I hope every anyone has an with experience in this field to can tell me about
and explains the difference between network , mobile network and IT.

But to respond to your comment.. a network is made up of "nodes" which can be some combination of servers, switches, routers and other "black boxes" that are connected together using some form of links -

One type of link is wireless, which is the main way that devices on a "mobile network" are connected. This includes smartphones, tablet devices, and even laptops.

Of course, there are non-wireless parts that are needed for a mobile network to connect. This includes the basic parts of the Internet, which is the backbone of what we consider IT, or Information Technology, these days.

There are many things that make up IT - both legacy vs. current, proprietary vs. public, portable vs. desktop and so on. Overall, it is how we process information to get things done. Although some folks point to the darker vision that the Terminator series depicts with Skynet, I like how my smart phone gives me a timely update to avoid the traffic jam caused by an accident on my route.