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What David stated will work on a non-subnet'd class c network. If you subnet that, then it would be the highest IP in the subnet (i.e. network is from 192.168.1.1 to 192.168.1.32, then 32 is the last octet). I figure he knows that, he was just trying to keep it simple.
And in case you STILL want to know what a broadcast ip is...
Broadcast is the term used to describe communication where a piece of information is sent from one point to all other points. In this case there is just one sender, but the information is sent to all connected receivers.
So the broadcast address can be used to send a message to all the computers connected to a LAN (e.g. ARP uses it to send address resolution queries - try 'tcpdump' and you will get the idea)
'Hey, what is a car?'
'It's a Ford or a Toyota or a Rover... '
'Umm, thanks a bunch.'