Bid
Basics
What it means
The highest price someone is currently offering to pay for an asset. It is the price you get if you sell right now.
Example
If AAPL shows a bid of $150.00, a seller using a market order to sell 1 share receives $150.00 per share.
Mistake beginners make
Beginners stare at the last traded price and assume that is what they will get, but the bid -- the live offer to buy -- is the real cash-out price the instant you sell.