Laravel with(): What this method does?

I am new on Laravel and working on small application. In Laravel tutorials, I have read the with() method of Eloquent model but not able to understand it's working clearly.

I have seen many tutorials to clear this concept. Somebody post small understanding and somebody post deep understanding of with() method. At one place someone trying to clear this below example:

$collection = Model_1::where("year", 2016)->with(array("Model_2"=>function($q){$q->with("Model_3","Model_4");}))->with("Model_5","Model_6")->get()->toArray();  

Overall, still I am not able to understand the concept of this method. Please anyone can clear me the concept of with() method and explain the working of above statement? Thanks in Advance.

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