The definition of bid can be related to propose a payment or an offer for particular products. Now a days bidding is the successful word which occupies share market to internet Ad agencies.
The source of bid is money and every bidding systems must complies certain terms and conditions. For example of an online bidding community lowest bid from here the lowest bidder could win the prize at the same time he would pay some amount of money for the particular product. For example apple Ipod has the lowest bid value and you can check here Apple Ipod bids The bidding systems are generally used in share market and IPO (Initial public offer) of an major corporations. I would like to win apple Ipods because it's very smarter and compact.
The bidding systems has lot of advantage and disadvantages can meet some of vulnerabilities. This is a paid post.