Financial terminology/ Investopedia

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Order book:
An order book is the list of orders that a trading venue (in particular stock exchanges) uses to record the interest of buyers and sellers in a particular financial instrument. A matching engine uses the book to determine which orders can be fulfilled.

Limit order: 
An order placed with a brokerage to buy or sell a set number of shares at a specified price or better. Limit orders also allow an investor to limit the length of time an order can be outstanding before being cancelled. 
Buy limit orders can match at prices less than or equal to the limit price.

Fill and Kill (FAK):
A type of time-in-force designation used in securities trading that instructs a brokerage to execute a transaction immediately and completely or not at all. This type of order is most likely to be used by active traders and is usually for a large quantity of stock. The order must be filled in its entirety or cancelled (killed). The purpose of a fill or kill order is to ensure that a position is entered at a desired price. 

Market order: 
An order that an investor makes through a broker or brokerage service to buy or sell an investment immediately at the best available current price (best price). A market order is the default option and is likely to be executed because it does not contain restrictions on the buy/sell price or the time frame in which the order can be executed. A market order is also sometimes referred to as an "unrestricted order."

Market order is not allowed during Circuit Breaker Trading Halt, for Regulated Short Selling (RSS), Proprietary Day Trading (PDT) and Permitted Short Selling (PSS).

Fill and Kill (FAK) Order:
An order to buy or sell that can be filled partially or canceled 

Fill or Kill (FOK) Order: 
An order to buy or sell that must be filled in its entirely or canceled

Stop Limit Order:
Orders that become limit orders when the trigger price is reached. The trigger price can be set at <= or=> of bid, ask and last done price. This order is used in combination of Day type validity and can be executed during Main Trading phase only.  -- (Not yet in Malaysia)

Stop Market Order:
Orders that become market orders when the trigger price is reached. The trigger price can be set at <= or=> of bid, ask and last done price. This order is used in combination of Day type validity and can be executed during Main Trading phase only. -- (Not yet in Malaysia)