The ask price is the amount that the buyer is willing to pay, the offer price is the price the seller agrees to. The difference between them on the exchange is called the spread. When submitting an order to buy or sell, the number of shares is also indicated. Accordingly, the order will be executed only when both prices and quantities match. The trade will be reflected in the chart on the stock market, but there is no guarantee that the next trade will take place with the same parameters.