Buy Order
When you want to buy shares you place a buy order. You just tell your broker how many shares you want to purchase. There are several types of buy orders:

Buy at Market
To buy a specified number of shares at the prevailing market price.

Buy at a Limit
To buy a specified number of shares at a specified price or lower.

Sell Order
An order you place when you want to sell shares.

Sell at Market
An order to sell shares at the prevailing market price.

Sell at a Limit
An order to sell shares only at the price that you specify or higher.

Sell at a Stop Limit
To sell your stock if it falls to a certain price.