Battery 18650 pack 12V Many questions

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BatPower
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Battery 18650 pack 12V Many questions

I have many questions about 18650 battery.
I want build 12v 18650 battery pack from battery computer , but before i want learn more about 18650 battery.
So my questions are :
What is the difference between BMS and PCM board?
What is the difference between balance charge , and normal charge?
Does exist an electronic board to charge a pack battery?
I want to retrieve laptop batteries , but how charging?
What is the charger i need to charge the x3 battery at the same time ?
Because i want make a pack and not charge the battery 1 per 1.
I have see a charger “lipro balance charger” how it’s working?
I see somes pack on ebay:
http://www.ebay.com/itm/LG-LI-ION-RECHARGEABLE-BATTERY-PACK-6-CELLS-11-1V-4400-mAhr-18650-OZONICS-/190914379825?hash=item2c73624031:g:ahoAAOxy5rpSRJdp&rmvSB=true
How is working ?
What is the charger i need to charge the pack from ebay?
The board to charge is in the pack?
Thanks in advance to help me , i’am lost. Cordially,