A two-way price quotation that represents the best possible price at which a security can be sold and bought at a specific moment is referred to as "bid and ask" (also known as "bid and offer"). A buyer's maximum price that they are willing to pay for a share of stock or other security is represented by the bid price. The least amount a seller will accept for the identical security is represented by the ask price. When a seller is prepared to sell for the highest price or when a buyer is prepared to accept the best offer on the market, a trade or transaction happens. One important measure of an asset's liquidity is the spread, which is the gap between the ask and bid prices. When there's more liquidity, often time the spread is narrower.