bidding documents a bidding document refers to a document in which the bidder submits a quotation to the tenderer and fills in a bid form according to the conditions and requirements of the tender document. It requires that it be sealed, mailed or sent to the tender unit by special personnel, so it is also called the bid letter. It is a bidding document compiled by the bidder on the basis of fully understanding the bidding documents and conducting on-the-spot investigation and investigation. It is a response and commitment to the requirements put forward in the tender announcement, and at the same time, it puts forward specific price and related matters to compete for winning the bid.