When you place a limit sell order, you are establishing a price (the limit price) that is the lowest price at which you are willing to sell. Your order will only get executed at or above your limit price. A stop sell establishes a price lower than the current market price at which your order will be executed at market price. Stop sell orders are often referred to as stop loss orders because they put a cap on the amount of losses you will endure if your stock starts to decline.
