On ebay, bidding is the popular way to buy most items although one can still buy right away without bidding. But for more costly, rare or valuable items the most common way of selling and buying is by bidding. The highest bidder usually wins the item. But you do not have to sit the whole at your computer to bid on ebay. You have ebay bidding software to do that for you. All you need to do is to set a minimum and a maximum bid and the software will bid for you to the maximum you specified.
Auction bidding is a good way to raise funds for charity because more is paid for items than if they were sold the regular way but the items have to be well chosen in order to catch the attention of buyers.
Other kinds fo bids are placed to welcome sellers to propose their goods at the best price. Hence most countries have government bids for suppliers of various goods. The bid is usually given to the bidder with the best price quality ratio.In all cases effective bid management is needed.