Simulated AAPL order book. Send market orders to see how matching works in real time.
Executes immediately at the best available price. The active side — it accepts the passive side's price.
Sits in the order book at a specified price. The passive side — it creates liquidity and sets the price.
The gap between the best ask and best bid. Narrower spreads mean a more liquid, competitive market.
The price of the most recent completed trade. This is the big number shown on platforms like Robinhood.
A limit order priced to cross the spread — bid ≥ best ask, or ask ≤ best bid. Matches immediately like a market order, consuming queued orders until price is no longer satisfied.