What is Market order?

An order that executes immediately at the best available price, consuming the book.

Market orders prioritise speed over price. The fill is the weighted average of the levels the order sweeps, not the quote on screen.

In thin markets a market order is the expensive way to trade. Nearly every exchange shows an estimated slippage figure before you confirm — read it.

Limit orderTrading
An order that only executes at your price or better, and can sit unfilled.
SlippageTrading
The difference between the price you expected and the price you got, from moving the book yourself.
Order bookTrading
The standing bids and asks at each price on an exchange, and the size waiting there.

See it on a coin page