An order to buy or sell immediately at the best price currently available. It guarantees a fill in a liquid market but not the exact price.
The ask is $25.02, so a market buy for 100 shares fills at about $25.02; in a fast market it might fill at $25.10.
The simplest order. Fast fill, but the price isn't guaranteed.
An order that buys or sells right away, at whatever price there is.

Buy or sell now at the best price.
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by John C. Bogle
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