How service provider works in laravel 5.1?

I read about service provider in laravel.i found many methods like

1.The Register Method

2.The Boot Method

3.Registering Providers

4.Deferred Providers

My question is

1.How it works ?

2.when we can create these type of service providers ?

3.whats the advantage of these service providers ?

ref:http://ift.tt/1EXRcwI

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