BID- When a trader wants to indicate that he wishes to buy a security he will make a bid. Price specified in a buy order is known as a BIDDING PRICE
OFFER-when a trader wishes to convey that he is seeking to sell a security he will make an offer. Price specified in the sell order is known as ASK /OFFER PRICE .
*The highest bid in the market is known as BEST BID and lowest offer price in market is known as BEST OFFER.
*THE DIFFERNCE BETWEEN BEST ASK AND BEST BID IS KNOWN AS BID ASK SPREAD , IT IS ALSO KNOWN AS INSIDE SPREAD AS IT IS OBSERVED WITHIN THE MARKET