Market Orders (Market to Limit)
A "Market To Limit" order is placed at the opposing offer when buying shares. If there are insufficient shares in the market to complete your order, the remaining balance of your order will remain on the market at the best opposing bid/ask price until more buyers or sellers come in at that price. Market orders cannot be accepted outside of market hours.
"Limit" orders place a limit on either the maximum price you will pay or the minimum price you will accept. Limit orders can be placed at any time, but can only be executed when the market is open.