What is an auction?
An auction of a way of buying and selling items by offering them up for bid. It is essentially just a specific form of trading that follows certain rules.
The way auctions are run may differ. The most common form is the English auction. Usually, there is a minimum bid, which is named by the person running the auction. This is the lowest price at which the item can be purchased. Usually following is a time period in which participants bid against each other. Either the bidders themselves or the auctioneers announce prices. Higher and higher prices are named, the highest being publicly displayed. Sometimes there is a time limit, and the highest bidder at the end of that time limit buys the item. Other times, the auction continues indefinitely until people stop bidding either because the bidding has reached the maximum price or because the people participating are no longer willing to raise the bid any longer. After the bidding is over, the item is sold to the person who is willing to pay the most for it.
Another less popular form of auction is the Dutch auction. This method contrasts the previous method because the auctioneer names the highest asking price. Normally, few people are willing to pay this, so it is lowered until somebody accepts the price and buys the item. This type of auction is sometimes used for perishable items, but it is generally not very widespread.
The Sealed first-price auction is another form that is sometimes used. In this auction, all bidders submit one bid, and the person who submits the highest one buys the item it his or her submitted price. This is slightly different than the English auction, because no bidders know the bids of the other participants, and no one can bid more than once.
There are many more forms of auctions, but many of them are only variations of the English method, the most popular form and the most well known.