What is the difference between URL Router and Dispatcher?
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I want to know the difference between the URL Router and Dispatcher, because searching on the internet has some interesting things, just do not know if it's because they are similar, or because they reverse the function of each. Can anyone tell me what it is and what each one, and an example?

I do not know the differentiate from URL Router to Dispatcher, the question of content they have on the Internet, sometimes it seems the Dispatcher is the Router, and the Router seems Dispatcher, and end up not knowing what the right of each, what is each one, and how implement each one.

Thank you.