Hello everyone, I need more information about pppoe protocol like where do we need it and what advantage does it offer and how is it different from PPP any link u people can suggest or PDF, any help will greatly be appreciated .?

PPPOE is a similar protocol like PPP.But as we use PPP over serial links , we use PPPOE over ethernet links.(ETHERNET LINKS  DOES NOT SUPPORT PPP BY DEFAULT)

To understand how PPPOE works:-
1)We have to create Virtual template interface in ISP, bind that virtual interface with bba group and then call than bba group on your physical interface.
Virtual template interface can automatically be divided into multiple virtual access interfaces
as different customers form p2p connection
2)We have to create Dailer interface on clients , by default dailer interface have encapsulation HDLC, change it to PPP, then bind that interface to ethernet interface.
3)Nor Lets say Cust1 want to bulid P2P connection with the ISP.
Client will generate PPPOE discovery packet, it will be a broadcast.
Now active server(in our case ISP) will send a offer as unicast(telling its own mac address)
Now client will send request to the particular server and server will give the acknowledgement.
Now client actually know mac address of server, now client will send 1st PPP packet to the server.
PPP working is done by two sub protocols:-
LCP (Link control protocol)- Used for link negotiation, authentication.
NCP(network control protocol)- Used for actual data traffic.
IPCP (additional protocol)-- by default on (can be used to provide ip address to client)
First of all negotiation is done, then link will come up.
You can use both PAP and CHAP authentication you were using with PPP.

On ISP, you will get a virtaul access interface for the particular customer.

If you want pratical domonstration let me know.