Difference between Calender spread and ratio break spread.

A Calendar Spread is an option spread where the strike prices are the same, but they have different expiration dates. These spreads are also referred to as horizontal spreads or time spreads.Calendar spreads can provide a way to add value to your portfolio through your purchase of a long term option with a reduced cost basis, provided by a near term option that you sold.A ratio break spread is a very bullish investment strategy that combines options to create a spread with limited loss potential and mixed profit potential. It is generally created by selling one call option and then using the collected premium to purchase a greater number of call options at a higher strike price. This strategy has potentially unlimited upside profit because the trader is holding more long call options than short ones.