A good ’til cancelled order, or GTC order, is an instruction given by a trader to their broker to buy or sell a security at a specified price that remains in effect until either the order is executed or the trader cancels it. Unlike a good-for-day (GFD) order, which expires at the end of the trading day if not filled, a GTC order can remain in the market for an extended period, potentially even for weeks or months, until the order is either filled or cancelled. GTC orders are commonly used by traders who want to place an order at a specific price, but may not be actively monitoring the markets and want the order to remain in effect until filled.