Bull call debit spreads are strategies that are designed to profit from a directional move higher in the underlying stock. Because you are a net buyer of options, you could also profit from increased implied volatility (though it's not as likely). These are generally low probability trades because that end up being 50-50 bets on the underlying direction. As a result, we do not trade these types of strategies often in our portfolio but will occasionally use them for rebalancing purposes.