How does maven internally manages package dependency?

[Debraj Manna]

Can some let me know how does maven internally manages package dependency?
Is there any architecture diagram available on the net for the same? I also
asked this in Quora
<https://www.quora.com/unanswered/How-does-Apache-Maven-work-internally> but
did not get any response their nor I am able to find any suitable resources
in the web that explains the working of maven and even better if I can find
some class diagram?