#OrderTypes101 What it is: The simplest order type. You instruct the exchange to buy or sell an asset immediately at the best available current market price.

* When to use it: When speed of execution is your top priority and you're willing to accept the prevailing price.

* Caveat: In volatile or low-liquidity markets, the execution price might be significantly different from what you saw just a second ago (this is called "slippage").