The offer price, or the Bid price is what an investor is willing to pay for an investment. It is only an offer and will not be accepted if the seller is not willing to let go at the offer price.
The difference between the ask price and the sell price is called the “spread” and it is kept by the broker.
The price, aka “the ask”, is the lowest price that a seller is willing to accept for a security.
When you are selling your shares of a security, the bid price is what the buyer is willing to pay for your shares.