Glossary
The gap between the best bid and best ask price.
Spread is the difference between the highest price a buyer will pay (bid) and the lowest price a seller will accept (ask). Tight spreads mean deep liquidity; wide spreads mean thin markets and higher trading costs.
The list of outstanding buy and sell orders for a market.
How easily an asset can be bought or sold without moving the price.
The difference between expected and executed trade price.