A buy trade is a trade position on a market where the trader is expecting the price of that market to rise. When the position on that market rises the position increases in profit for that trader.
There are a few types of buy trades for CFD traders when using a broker like ICMarkets or similar. A buy market trade, this is a trade that buys a particular market at the current price. A buy limit trade is a trade position that will open at a specific price the trader sets on that position if price reaches that price, until then this trade remains a pending order. A buy stop is a type of buy trade which opens if price moves above the price that is set on this order ( such as a breakout trade or price breaking above a bullish price action setup ).