An order that will be executed only at a price equal to or better than the set price.
An order that will be executed immediately at the best prices in the order book. When buying/selling large amounts of cryptocurrency using market orders, you should determine in advance whether there is sufficient liquidity in the order book, i.e. whether there are enough limit orders with reasonable prices to fully execute the market order against limit orders. Otherwise, part of the order will be executed against someone else's orders with less favorable prices.