Market Order
Also called: at market, market buy, market sell
A market order executes immediately at whatever price is available, guaranteeing a fill but not a price. In liquid names the difference is a cent; in thin ones it can be catastrophic, since the order walks the book until filled. The 2010 flash crash printed trades at a penny for exactly this reason, which is why limit orders are the safer default outside the deepest markets.
Where this is taught
Definitions are the trailer. These free levels turn Market Order into something you play — one bite-size lesson, with worked examples, a quiz and XP.