How does Internet Service Providers work and how does it meet the
needs of its users? Graphs or Pictures explaing would be useful.
Please provide links where you got your information if applicable.

Hi! Thanks for the question.

Our first resource provides a complete answer to your question. The
ICT Advice website presents an easy to understand 4 page article on
how an ISP works and how it meets the needs of its customers.
 
“What is an ISP?”
http://www.ictadvice.org.uk/index.php?section=te&rid=525


An understanding of how an ISP works however is incomplete if you do
not know how the over-all infrastructure of the Internet works. For a
great easy explanation complete with graphics we can go to one of my
favorite websites, How Stuff Works. After reading the first article
and this one, you will now have a broader understanding on how ISPs
work.

“How Internet Infrastructure Works”
http://computer.howstuffworks.com/internet-infrastructure.htm/printable


I also found an interesting presentation on the net on what are the
usual personnel and equipment involved in setting up an ISP. I suggest
that you go through the presentation to deepen your knowledge as
regards this topic.

“Basics of ISP Construction”
http://www.enigma.ie/presentations/Basics%20of%20ISP%20construction-enig.htm


In case you are interested in building an ISP of your own, the ISP
Planet website gives you the basics on how to setup one and some of
the issues you have to concern with in doing this project.

“ISP-Planet Guide to Building an ISP”
http://isp-planet.com/resources/isp_guide/index.html

“Storage Basics”
http://www.isp-planet.com/equipment/snotes/2002/sbasics_020711.html 

“Storage Notes: Every ISP Will Need A Tape Library”
http://www.isp-planet.com/equipment/snotes/2003/snotes_030418.html 

Search terms used:                 
ISP basics
“What is an ISP”
How do ISPs work

        
I hope these links would help you in your research. Before rating this
answer, please ask for a clarification if you have a question or if
you would need further information.
                
Thanks for visiting us.                
                
Regards,                
Easterangel-ga                
Google Answers Researcher

Wow that was fast! Great Response

Thanks for the kind words, nice rating and for the tip! :)